Pathetic service from MTN South Africa

I have been using mtn ever since iv owned a phone that's like 20 some odd years now and I took out 2 contracts with them and ever since I have taken a contract with them I have been having issues there contact center is pathetically *********** I asked the advisor to activate my sim as it was a delivered order the advisor sent to to 3 different departments before the call was disconnected it took a couple more tries to actually speak to someone who promised the issue was resolved and 8 months down the line it was resolved note within the 8 months I continued to pay for a service I never received so I asked for the issue to be escalated so that I could be some what compensated for something I paid and till date I haven't been compensated after a while I needed a new line and was very doubtful to continue taking another contract with mtn but I continued said they may have resolved the issue so I did and immediately I had issues delivery promise failed re arranged a date and that was failed until I was adamant to have it delivered as promised so I had to contact the courier company myself and then only the item was delivered mtn never helped with the issue now I have been buying data cause I tend to work of my phone at times due to being away from my office more than expected and I purchased 5 gigs data which is quiet pricey and the transaction failed then after I said never mind network does have time to time delays so I waited and nothing happens no data but charged for the purchase then I said why not try again and I bought a smaller bundle 2 gigs and the very same issue so I Called mtn and spoke to an agent who clearly did nothing to assist and I requested to speak to a manager and the agent cut the call I then called back asked to speak to a manager and spoke to the manager only after advising who I was and that I knew the managers of the business he only then took my call the guy helped me and said he would do his duty of following up with the issue as I allowed them time to work on the issue and I gave them 6 business days to resolve the issue and till now iv not gotten a call so I called them now been on a call for the past hour no assistance and can't seem to speak to the manager this is honestly the worst service ever I had and clearly I don't understand why I can't get any assistance when I need it I mean my bills are paid on time no missed payments and issues is all I get