Unhappy Customer MTN is the worst place to ever go to take a contract. Mtn robs customers

I am really experiencing terrible challenges with MTN. First when I took the phone the sales consultant **** to me that I cannot port my sim. I sent a long mail to MTN complaints however nothing was done about it. Melinie Moodley the manager from MTN gateway called me and apolgised for the inconvenience occurred however up till today she did not give me feedback or call me to let me know what is happening. I took a cellphone contract which was a Samsung Galaxy Note 20 LTE which was R649p/m. I took the phone contract in February 2021 middle of the month. They advised me that they will charge me a pro rata amount and my new monthly subscription. Towards end of the month Melanie phonned me and advised me that they will debit around R749 if i'm not mistaken on my pay day which was end of March 2021. However at the end of March they billed me R749 and on the 1st April they billed me R649 which was twice. I went to MTN in gateway where i took my contract and requested to speak to Melanie, Melanie advised that it was incorrect and I was billed incorrectly. She advised that they will reverse the debit but it will take some time which she cannot say but if i go to my bank and reverse it, it will be quicker. So I took her advice and went and did that. I also asked her if she will get back to me regarding this matter by end of day she said yes she will. This beginning of April. Up to today, She did not get back to me. MTN keeps sending me mails stating that my services are suspended because I never pay yet they billed me incorrectly. My services are suspended yet I did Pay. My credit score has dropped because of all this. Nobody at MTN is not bothered because I'm just a customer and everytime I go and ask for the Manager Melinie, she is never there or probably all the days I'm going there she is off or they lying. This is terrible and pathetic coming from MTN. This is really unfair!They also gave me free 20gb for one month when I took the contract yet I never used it because Melinie advised me not to use it. I need urgent feedback!Im sick and tired of this now. Now MTN sends me a mail that they going to debit R1287 from my account.MTN is damaging my name! And they will not take accountability because they don't know how to do their jobs correctly.I work in customer service and we would never treat our customers in this way.

Even if they suppose to charge me pro rata which they did, pro rata cannot be so much like R649 if my contract is R649 and debit me an additional R749.