MTN refund and customer support

MTN deducting costs from account for 2 months after I cancelled my contract. THe worse experience I have ever had with phone calls that keeps dropping, poor atitude from customer service, cant speak to any supervisor or manager over the phone consultant has to mail supervisor and never recieve a call back from any manager. This is the 2nd month money has been deducted from my account after I cancelled the contract already 3 months ago. I logged a call for refund of last month and after 3 weeks still nothing no call no email no update nothing now again I have to call mtn due too consultants that cant even read spell or speak properly over the phone. All I want is to speak to a manager that can sor tmy money out and give my refund back for the 2 months.