Mtn

I’ve been trying to get a hold of someone to assist me at Mtn for almost two years now. I’ve been going into branches, making phone calls, sending emails & nothing. I received a contract that’s never been activated, never been used but money has been deducted every single month.. I’ve been trying to cancel but no one can assist me. Now it is messing up my credit rating and I’ve been asked to pay a fee. How can I pay a fee for something I’ve never used? Please can someone help me because no one at Mtn seems to know how.