How does cancelling a debt management program affect my credit cards interest?

if the debt mgmt program lowered your rates, I imagine the rates would go back to what they were

Usually, when you are under a debt management program, your debt expert may have arranged for a lowered interest rate on your credit card. If this is the case, then when you cancel the program, your interest concession is also cancelled. You may have to revert to your old interest rates. However, if you need further information about this, you have to consult a debt expert like debtburst or creditdebtsolutions, who can give you valuable advice and answer your question.

i believe you'll answer all your questions by reading the fine print on the contract you signed with them. the small print is very important.