Suspends account during lockdown without notice

I have posted the below issue with MTN on 16 March. Had NO repsonse to date. And on the 1st day of lockdown, they suspend my services, with no prior notification. This after they have admitted to billing me incorrectly and "resolving" their accounting problem. I have an elderly mother that relies on the data account to stay in contact. This openly bullying of customers should be a crime.

I have been struggling since November 2019 to have a monthly overcharge reversed. I eventually upgraded in December 2019 hoping it will highlight the issue. It has in fact compounded it. My line has been numerous times since then due to MTN's inability to do proper billing. They overcharge my account with over R500.00 every month. I reject the debit order and only pay the agreed contract amount. This they seem not to be able to comprehend. My monthly bill of R1360.00 has escalated to over an R4000.00 bill. This is ******* in my opinion. The amount they try to debit is not what was agreed, as per the contract. I'm expected to pay the full amount, then they will solve the issue. Seems MTN is in financial trouble, as I've noticed a LOT of incorrect or unnecessary billing going on lately. Now in times when working remotely from home is required, my mobile account is frequently suspended.....come on.

Good day