Pentagon FCU Credit Card Complaint

Pentagon FCU Credit card department,

Balance transfer Kentucky

I transferred a credit card balance of approximately $3600.00 to Pentagon Federal Credit Union ( PenFed ) on their 0 % balance transfer program in - 2016. After a few months on the program, I noticed that my account was being charged interest. This is not an obvious thing as I have a Platinum 'rewards ' card and usually received some credit each billing cycle as a result of gas purchases. I did some rough math and determined that I was paying interest on purchases on an average from the purchase! Not from the billing date or the period after that! I called PedFed and talked to Customer Service. The technicians were at a loss trying to explain what was happening. I was transferred to a Lead/Supervisor named - and got enough of an understanding that it came to one question : Could I pay the total balance with the advance and othe transactions and clear it up? - 's response was yes. How I started paying interest on an undisclosed process bothers me a lot. I wrote a letter to PenFed 's President dated - - 2016.