Complaint

I have a contract with Mtn with cellphone number: ********** 172 ,my monthly payment is R1225 which they deduct every month from my account.On the 1st of November an amount of R2970 was deducted instead of R1225,i called the customer care line:808 on the 1st November to find out why was i overcharged for this month,i have been calling every week i cant get answers till today.Every day i am promised that they will look into the matter and they will contact me within 48hrs but so far i am the one who calls them,i need your assistance on the matter please i want my money back.I have been having problems with Mtn since the beginning of this year,they take my money as they please from my account and always tell me that i owe them which results in them blocking my line all the time,even if make a mannual payment and send proof they always say i have outstanding amounts which i dont know where they are coming from.I am really fedup with Mtn and hope the matter can be resolved soon.Your interference will highly be appreciated.Thank you.