********** upgrade and bad service from MTN

My account was badly handled, it expired in February, i previously sent a request and called to convert it to prepaid in January and February upon expiry. MTN failed to do this and instead extended my account by another 24 months, sent documents to ***** department on the 25th of February, unfortunately they could not resolve it after repeated calls. I must thank and recommend Simphiwe Mtembu for promotion to call centre manager after (I only called her yesterday and got a response this morning) she managed to resolve the ***** issue within 12 hrs when others failed for a month. I want reassurance that the amounts debited from my account of 619 x 2 = 1238 will be credited back and the account will be cancelled with immediate effect. I feel strongly that MTN should correct their systems as I read a similar complaint with ref (***) on this forum. This was also resolved after the intervention of Simphiwe Mtembu (Wow, she's a warrior). Can MTN promptly send me a confirmation letter of their cancellation of the contract when it originally ended and refund the monies that were subsequently debited in error please.