Bad service and no response

Made a payment to close my MTN contracts in March only to find out June 2018 i over paid and have credit Avail of R2500 after calling in the begining of June then the credit came down to R2100 , as explained i didnt close my account thats the cause of the amount being deducted once again i have been battling with MTN Call Centre employers to please transfer my money back into my bank account up until 17.07.2018 im highly dissPOINTED as i got no response,Feedback and MTN emplyees keeps talking about an sms which i NEVER Recieved and they not getting any feedbacks from their banking department .....I have been a loyal customer for years and now i want nothing to do with MTN for the BAD service and will not recommend anybody to be their service providers ...I have Recieved 4(four) references in this period with no Joy from the banking department from MTN or Customer services ...(1- ********** 7843), (1- ********** 6151), ( ********** 86), ( ********** 20), I dealt with ********** ********** ********** and now today Sane.Lisiwe...... all of which i had to contact !!!!!!!!!