Costco's credit card nightmare just got even worse

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What to know for Costco credit card switch

Costco's marriage to Visa has been rocky pretty much from the start. And this weekend, shoppers faced a new problem despite assurances that issues in the relationship were being ironed out.

On Friday evening, a number of Costco members received emails from Citi, the issuer of the new Visa-Costco credit card, alerting them that their credit card accounts had been closed.

In at least some cases, members reported that they received emails addressed to other people that contained the last four digits of other users' account numbers, raising concerns that their accounts had been hacked.

The emails represent another speed bump in Costco's transition from American Express to Visa as its credit card of choice. The move, finalized in June, affected 11 million Costco members, who were required to transition from the TrueEarnings American Express Costco cards to the Costco Anywhere Visa to earn rewards through a Costco co-branded credit card.

Following the transition, users threatened to cancel their Costco memberships because of initial and ongoing issues.

Citi told Business Insider that Friday's emails were intended to be sent to Costco shoppers whose memberships had lapsed to alert them they could no longer use their Costco Anywhere Visa cards. However, because of a systematic error, a number of active Costco members received emails intended for other cardholders.

Citi said the users' accounts were not compromised in any way, and the mistake only affected a small percentage of Costco members.

Those affected by the error complained on social media:

Costco members said that they had to wait more than 30 minutes on Friday and Saturday to speak to Citi representatives about their accounts.

On Saturday evening, Costco emailed all customers who were affected, instructing them to disregard prior emails regarding the Costco Anywhere Visa.

"Your account and the cards for any existing authorized user(s) are open and available to use," the email reads. "We apologize for any concern or inconvenience this may have caused and please be assured your account has not been compromised."

The transition from the TrueEarnings American Express Costco card to the Costco Anywhere Visa card has been a longer process than anticipated.

"We're working through that," Citigroup CEO Michael Corbat said of the transition in a call with analysts after reporting second-quarter earnings in July. "We're gaining on it. We're very focused on it. We've got a lot of resources deployed against it, and it's something we can fix in the short order."

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According to Corbat, Citi faced "extremely high calling volumes" from customers with questions about card activation, statements, and payments.

Citi's inability to respond to customer questions was one of the biggest problems in the Costco credit card transition in late June, with members facing long wait times and dropped calls while waiting to speak with Citi customer-service representatives.

"Worst credit card transition ever — 4 hours and counting on the phone with Citibank and they still can't get my cards to me," one Costco member wrote on Facebook. "Saving money isn't worth alienating your members ... seriously rethinking my patronage."

Customers complained in June of not receiving their new Citi Visa cards in the mail and not being able to use corporate American Express cards at Costco, following the switch to making Visa the retailer's exclusive credit card partner. They've also complained about charges being flagged as fraud, and that the transfer of rewards dollars has been lower than expected.

Despite the complaints, Citi says the swap has been an overall success.

Citi reported more than 337,000 new account acquisitions to date since the switch — a number that significantly exceeded Citi's expectations. Purchase sales on Costco Visa co-branded cards totaled $5.7 billion in the three and a half weeks following the transition, according to Citi.

RELATED: 11 items to always buy at Costco

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11 items to always buy at Costco
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11 items to always buy at Costco

1. Fresh produce

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2. Gas 

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3. Wine

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4. Dairy products 

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5. Eyeglasses

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6. Giftcards

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7. Dog food

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8. Baking items 

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9. Bakery goods 

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10. Oils (coconut oil, olive oil, vegetable oil)

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11. Costco's snackbar (hotdogs, pizza, soda) 

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