<prompt> Human: Nearly a month after I left an airport parking garage, I got a letter in the mail saying my credit card did not process properly. My card went through at the time I have the receipt and I was nowhere near the credit limit. The charge initially appeared on my credit card statement but subsequently disappeared. All my other charges that day posted properly, which leads me to believe that it was a problem on their end. Now they will only accept a check and are asking for payment within 10 days, despite the fact that the letter was postmarked nearly two weeks after it was dated. This seems highly unprofessional and somewhat suspect to me, though the letter came from the airport itself. Does anyone have any advice?  <response>: Pay it? Whats the issue? You arent being charged twice. 