Help me WalletPop: Southwest Airlines lost my ticket and charged me twice

Dear WalletPop:

On Oct. 8, Karl and I checked into our Southwest flight to Vegas. The man at the counter was totally distracted -- carrying on a conversation with another employee behind the counter. I really didn't think much of it at the time but ... he carelessly placed our tickets back on the counter and continued his conversation. I picked up the tickets and noticed that we ONLY had a boarding pass now.

We originally had handed him lavender oaktag tickets we received in the mail three weeks before, and those tickets were for our flight to Vegas as well as our return trip. When he handed us back a plain-paper boarding pass, I asked if that was all we needed. He stopped his conversation mid-sentence and told us we were free to proceed.