Credit Card problems

Are you sitting down because this will be hard to believe.
I received my first bill from the credit card company, it was about $3k. So I went to the bank on Monday to pay the full amount. But my available credit didn't return to the normal credit availability. In other words, the 3k went from my checking account but it seemed it was not received by the credit card company.
So I went to the bank on Friday to straighten this one out. The bank called the credit card company. What happened: the credit card company put a hold on the 3k payment. It was flagged by the computersystem because it is not normal for someone to pay such a large amount on his credit card. People pay only a small amount and don't pay their bill in full. Can you believe that, I must say I was "nailed to the ground" when they told me that.