What people tend to forget is that you can negotiate for a lower interest rate, especially if you have a good record with your provider, ie always on time, never exceeded your limit. Have the facts at hand before you call, know your stuff, such as how much you owe exactly and what competitors are offering interest rate wise. Then stick it out and insist on speaking to a supervisor if necessary.
If your credit card interest rate is too high and you are missing payments as a result, then you could bite the bullet and consult a debt counsellor who will negotiate for a lower interest rate, or smaller repayments on your behalf.
Check out
https://debts.org/debt_help