CLOSED ACCOUNT BUT STILL PAY

I am under debt review with Debt busters but i am not impressed with the balances that are not consistent. I do check my balance every time. to my surprise there was this account the balance was not consistent for three months. it was incereasing and decreasing. i have sent them an email regarding the query till today no one has contacted nor reply to my query. i paid again even though the account it is closed. they did debit money but still no one has contacted me regarding that. i will take it debt busters its a ****. paying for the account that it closed. how do you resolve this matter with them. Debt buster it is taking advantage