MTN South Africa is the worst network under the African sun

I have a debit order with MTN for R409 a month for a Laptop. I get debited on the last day of every month via my Nedbank account, end of Feb 2022 I noticed that I was debited over R11k , I contacted them and they escalated the matter to the billing department which never came back to me. I reversed the debit order and paid R409 as per my contract, last week I received a message stating that my number was suspended so I called only for that to be confirmed so I asked why and the agent couldn't tell me all she said was it was being investigated. It's the 24th of March 2022 and my number is still suspended and the issue hasn't been resolved why I'm very confused and now I keep getting messages saying my account will be stopped, Why?