<prompt> Human: Last week Capital One emailed me to inform me that my card was being upgraded to Signature, didnt really care either way, no new benefits, but the email stated that card number, APR, limit, etc would not be changingToday I got a email from Mint to inform me the APR had gone up .25, for the first time in 6 years... now I always pay the card off in full every single month, and the only time I ever paid interest was when I was unemployed four years ago, but Im still bothered by thisIs it worth it to complain to Customer service or should I just accept it?  <response>: Waate of time to complain. Your card is almost certainly a variable APR base on the prime rate. prime went up 0.25 so did your card.I dont even bother knowing what the APR is on any of my cards, it simply doesnt matter to me. I pay in full so pay no Interest 