Vodacom, Zero Customer service skills

Absolute disgusting service so many times from Vodacom, I have held a contract with them for over 10 years. 2 Years ago my upgrade process was a mess, and the data was never added to my contract, Two months ago I phone to cancel, and the re-tensions department almost matched my deal, So I agreed to extend 2 years again, only to get invoiced now in November, MORE that the agreed amount. I called 082135 and spoke to Thabang, Please Vodacom go pull that call at around 11:00am 15 Nov 2020 and listen to it, tell me if that is how you talk to customers, I counted 5 times the consultant yawned in my ear. Put me on hold for ages. And logged a back office request, that I can expect to hear something in 3 to 7 days. That is pathetic. Please advise on why the amounts do not match, On the upgrade call I explicitly asked and confirmed the total amount I will be charged, and it does not match my new invoice.