MTN is pathetic

MTN deactived my SIM card without my requesting so, I requested my contract to be changed to pay-as-you-go then my SIM card completely stopped working. I am working in Europe for a few motnhs and now cannot do crucial banking in SOuth Africa because my bank sends OTP to that number, which is now no longer working. I spent a lot of money making man, many, many calls to South Africa and nobody at MTN has the compitency to assist me, I also logged a problem on their website and also ahve been sending many, many, many emails, and still nobody with the compitency to help me. THis is URGENT that I get this number working again, but MTN is completeky incompitent, it was their mistake and all they can do sis hrug and say pay us. They already billed me for the pay-as-you-go service and deducted it from my account, which I cannot access even !!! THat is so *********, they take money from my account I cannot access to stop them from taking my money and their service does not even work, it is only costing more money, time and frustration. Unbelievable!!!! After being an MTN contract client for more than 30 years!!!! Loyally giving them my money.