I had previously used a 0 % interest check, in which for several months I had abalance, and I did make timely payments. During XX/XX/XXXX that balance was paidin full, ended with a XXXX balance. My XX/XX/XXXX statement shows a startingbalance of XXXX, I made a couple purchase transactions during XX/XX/XXXX, and alsoa partial payment on my account. I should have had an ending balance of {$40.00}, although I was instead charged {$1.00} minimum interest, as I had abalance I was told, even though the credit card agreement clearly states Ican avoid paying interest if I pay for purchases in full during the billing cycle. 
So the way I understand it, I would have until the due date to pay the $ XXXXto avoid interest. It was later explained that their systems calculated interestif the account was " coming off of a 0 % promo '' even though it had been paid infull timely. 
