Capital One Credit Card Complaint

Capital One Credit card department,

Credit line increase/decrease Tennessee

Each month I receive my credit card statement I make a payment usually the minimum amount due and sometimes a little more. Once I make a payment the amount paid is reflected as my available credit plus any credit that has remained from the last statement. Example : I receive my statement and the minimum amount due is -. I make the payment in the amount of - dollars and my credit card account shows - dollars available credit plus any existing available credit remaining from the last statement. The issue or concern I have is that when I receive a new statement I have a new minimum amount due and my available credit has been reduced subtracting interest that has accrued instead of the interest being calculated along with other transactions that would give me my monthly minimum amount due. It 's almost like I am being double billed. It is my understanding that the interest charges are calculated in the minimum amount due each month and the only time available credit would be reduced is when purchases are made.I do n't know any other bank or financial institution that reduces your available credit because of interest charges.