OVER CHARGING

It is now 9 moths since I start complaining that MTN is over charging me for a service I do not received. (75MB Recurring HYB @ R 25.44). After numerous e-mail and promise's from MTN, MTN is still not willing or competent to resolve my problem. They did agree that it is their problem but it just don't get resolved. I did send MTN customer care an e-mail on 15-Sep-15 but they still did not respond, now they are threating me to block my phones if I don't pay the outstanding R50.93. I also registered a complaint with the Consumer Goods & Services Ombud, and I am still awaiting their responds. When looking at all the complains on Hello Peter it seems that their it an serious problem at MTN. Where else can we complain about MTN's but service?