The worst service ever at MTN

This is my last resort to get help from MTN, I cannot log in on my MTN Portal on the web, mobile app keeps on giving incorrect invoices, I have been asked to dial numbers to geth through to "technical" which doesnt work, called in to customer service and asked agent to call the numbers that thy tell me to call and test for themselves and it still didnt work, agent supposedly escalated, thre more agents escalated the same matter. Got angry paid what they supposedly said I owe and cancelled all additional services on my contract. I am supposed to pay R739 every month and I have just received an invoice for 1125.03 and called in, agent(Zanele) found it difficult to explain telling me about insurance, which is included on the R739, agent said she would escalate the matter and it made me even angrier as I have been promised so many times that the matter would be escalated and someone would call me back. This is ***** and the service I am getting from MTN is absolutely *******. I would not recommend them to a single person.