Very bad customer service and accounts handling

I have a Mr Price account that I keep very strict control off. I never buy for the amount available - not even half of what I can buy for. Then I pay it off before I buy again. A while ago somebody phoned me and offered a simcard for R100 a month and R120 airtime. I asked them more than once - it is just R100 - I do not want any surprises. They assured me it was a R100. For a while it was all well. I gave my son the sim and he had to top-up himself if he runs out of airtime. Suddenly I saw charges for airtime and data on my account - a lot more than they even allow. How can this happen? I used the option in the past if I needed airtime - but only in emergencies. I tried to find answers by phoning and mailing them - no joy. So I decided to stop paying my account to get their attention - it worked. Suddenly they phoned and send sms's. I explained and said that I will pay my account as soon as they pay attention to the charges I did not agree to. I told them to cancel the monthly sim payment as well - I was told it is not possible. When I took them up on their offer I was assured that I can cancel at any time and keep the number and just go on normal pre-paid. Eventually they said I can cancel but they will give the cell number to another customer - not acceptable. Since I opened my account I received my monthly statements and promotional e-mails via e-mail. The moment I complained and asked for an explanation the promotional e-mails lept on coming but the monthly statement did not come anymore. They told me I am R1 700 (rounded off) in arrears. Every month they phoned to tell me I have to pay and every month we agreed on an amount of mostly R700 (one month was R600). Every single month when they phoned I repeated my problem and every single month the person made a promise to send me a statement - the last statement I received was in April 2021. They even said "I just mailed you your statement - but nothing was there when I checked. Last month I got an sms again - I am R1 700 in arears. I paid R700. They acknowledged my payment and said I am now R1 070 in arears. This is after I paid R700 and one R600 for months since April. The next day I got another sms telling me I am R1 700 in arears and if I want to continue making purchases I have to pay it immediately or I will be blacklisted. How is it possible that my arears stay the same when I keep on paying? Why do I not get statements but I still receive promotional mails? I am going to get a record of my payments at the bank tomorrow - I would not be surprised if I paid more than what I owed already. Why do I have to be harassed and **** to month after month? I still have no explanation of how it is possible that data and airtime charges of more than they allow is on my account? When did I agree to that? As a matter of fact I made it very clear I do not want that surprise to happen. I managed to block any more charges on that sim - I think I have but I can not be sure because I do not receive statements. What I do know - I can not buy airtime or data for myself on my account anymore. I had a good relationship with Mr Price but they made me absolutely hate them now. It was their bad customer service, their accounting that caused this. They **** and made promises they never kept and I had enough now. The last agent that phoned me actually put the phone down on me because I refused to make one more payment until I have a proper statement. She was rude and had absolutely no intention of helping me.