MTN SA DOES NOT HONOUR R76k CONTRACT

I upgraded my contract with MT South Africa on the 6th August 2021, at the Centurion Mall store. I have been a client of MTN since 1996. My usual contract is their MTN Sky black product which gives a subscriber unlimited data, voice calls, sms services, etc. Since the early morning of the 12th August 2021, I have no data connectivity, and extremely poor voice call reception - the contract value is around R 3 200 per month, which over the 24 month period means it is worth over R 76 000, 00. Having no data connectivity means that I cannot use the phone for the purpose intended. Several MTN representatives have tried to resolve the issue - the error message that see on the phone is that my number (contract) is NOT registered on the MTN network - over the past 7 days, but not successfully. In the meantime I am stuck with a R 76 000.00 (Seventy Six Thousand Rand Contract) with no one to turn to. This is MTN SA. The specialists i spoke to are Tshepo (in store employee), Mamarena, Margaret, Asanda, Monde, Luan, Moagi, Vuyiswa. What a **** show!