Terrible terrible service. Would not recommend.

I have a contract with MTN. I was called one day by MTN sales and was offered changes to my contract package, when I asked if it would cost me more per month I was told it would not. Since that call I have received incorrect amounts of money coming off of my bank account by MTN. When phoning customer care I was told my package has been changed. I then requested for my contract to be amended back to the original amount and for my money to be refunded to me as it was taken without my knowledge. I was told I would then have to phone through to another number, which was not till free, to request a refund. I was not impressed by this as I, the customer that has been **** to and wronged, should not have to spend my time and more money trying to phone MTN to get my money given back to me. Furthermore this has also had an impact on my credit record and incurred me fees on my bank account as the debit order on my account bounced to insufficient funds as I had not budgeted for this new larger eft amount to come off of my account. I have phoned through to MTN multiple times and I have been dealing with a manager and I have had no response from this manager for a few days now despite my multiple phone calls to place requests for her to call me back. My contract amount has still not been changed back to what it was and my number has been suspended. Please can someone from MTN help me.