Barclays Credit Card Complaint

Barclays Credit card department,

Billing disputes California

I transferred a $6700.00 balance to my Barclay - credit card in -, 2015. I transferred what I thought was that balance plus some ( $6800.00 ) OUT of the account 14 days later. Now EVERY SINGLE MONTH since I 'm charged interest on that Barclay card even though I pay off my statement every month. When I called the card company, they said that even though I transferred out the amount that I transferred in, they see it as I still owe interest on that money. They said that the only way to make it go away is that I pay off my statement balance AND any transactions that occurred AFTER the closing date of that statement balance. In other words, PAY MORE than what my ending balance is every month. They have credited me back the interest so far, but I have to call them every single month to get them to do that. There is something seriously wrong with this practice and it almost seems illegal.