I had a promotional balance that expired XXXX/XXXX/2015. The XXXX/XXXX/2015 statement balance was XXXX. I paid the full statement balance in XXXX XXXX and XXXX. Barclays did not apply the payments to the promotional rate and instead applied it to charges that were made after the statement generation date and not do an payable until the next statement generated. I was charged XXXX in interest on XXXX XXXX XXXX. I was told they were allowed to apply my payment to charges made after the statement generation date and not to the promotional balance which was paid in full XXXX times prior to expiration. I am also forbidden from " pre-paying '' charges until the next statement. It is a trap designed so that I can never pay off the promo balance. 
