Bank of America Credit Card Complaint

Bank of America Credit card department,

APR or interest rate Massachusetts

In - 2015 the minimum payment on my credit card was $270.00. I paid $300.00 and did not make any purchases, etc. on the card. As I understand it, $270.00 should have gone toward the interest and the principal of the lower interest rate ( 9 % ) and at least $24.00 should have gone to my highest interest rate of 16 %. When I look at my statement from - and my statement from -, though, the balance actually increased for the amount being charged 15.99 %. I called Bank of America - times and spent more than an hour on the phone. The - rep told me it was because I had underpaid - month ( I did not ), the next call I got disconnected and the - transferred me to a line that was supposed to have voicemail, but rang for more than 3 minutes without being picked up.