Unhappy customer

I wrote a review about MTN a month ago and also went to MTN stores asking for assistance and none couldn't help me they refering me to fourways and I have moved in that side,and I called they MTN customer care where I spoke to vuyisa and she also couldn't assist me and to me I had no option but to pay the money even though I explained I signed a contract of 530 why am I being deducted more,I explained first month I paid 930 and second month got deducted 830 and third month was 730 which I stopped n wanted clarity and she said I was suppose to read the contract and told him the consultant told me I'm paying 530 and didn't explain,and been getting emails that I will be blacklisted MTN it's a **** and when you voice out they threatening you with a bad credit ,and it's not fair and yesterday on the 28 of September I called the consultant by the name of bongani and he said he have left the business I should call customer care n should stop bothering him,I'm now left with a credit and can't get help,MTN is a ****