Still charging me 2 months later

Mtn is still charging me off my account after they have told me this has been sorted out and my number is on prepaid . Pay back the money and get someone to fix your useless systems and staff cause clearly they have no clue what they are doing. My number is on prepaid I can't call the contracts number 808 I can't phone the prepaid people to assist me on 173 is this not the same company , they can't transfer me to the correct department. My contract number is ***. <br> <br> To get hold of me ***. <br> <br>