terrible service and debiting without authority

i am so angry with MTN. my mother bought a phone from them on contract and decided that she didnt want it and returned it to th eshop way before the cut off date. They have been debiting every month and even though i have sent numerous emails they still debit. they are not supposed to be debiting as it was cancelled but they dont care.

example of one of the emails my mum sent and i sent and believe me i emailed everyone i could think of. now its time to take this further.

My name is Astrid Merle Fisher . I took out a contract in September last year and went to your MTN Pavillion Support Store and Cancelled the contract before the required seven days are up . I returned the phone to the store but you are still taking R318 from my account even though emails were sent to you on the 6th of September from the MTN Store saying that they had received the phone . He phoned in front of me and cancelled the contract. Why are you still deducting this R318. My reference number is *** my MTN pin number is 2, 4,6,8 The Pavilion Store number is *** my phone for that cancelled phone was ***. I am employed at Metropolitan Police Services and would like to be re imbursed from September up until March . Do not deduct R318:00 for this month . I don't have the phone . Your MTN Store cancelled the contract and returned the phone . Thanks .

Candace <***> Wed, Jun 19, 9:50 AM to Customercare, customercare3, support, customercare

GOOD DAY THIS HAS STILL NOT BEEN RESOLVED. THIS IS NOW GOING TO BE PUT ON HELLO PETER AND FACEBOOK. RIDICULOUS THAT MY MUM IS BEEN DEBITED FOR A PHONE SHE HANDED IN AGES AGO. REFUND HER FOR ALL THOSE DEBITS OR I WILL TAKE THIS THROUGH SOCIAL MEDIA LIKE A LIGHTNING STORM. I WANT THIS SORTED NOW. HER NUMBER IS ***

now how hard is this to resolve. how is it they keep debiting