MTN has the worst service

Worst experience I've ever had in my life, they are a **** and make you pay for contracts you never wanted. I ordered a sim card for R200 per month and they sent me the wrong deal with a router which was R600, I returned it the same day and they told me that they will cancel it and then I apply again and receive the proper one. 2 or 3 weeks later I get an invoice for the same contract I canceled, they call me and tell me I owe them then I send them the required documents so that they can cancel it, another week passes by I get an invoice for the same deal this time double the initial amount, I return to MTN Menlyn Pretoria for the 2nd time and they tell me it's done and the new one will be activated. Another week passes by and I get an invoice for almost R3000 saying that they will blacklist me if I don't pay. I am disappointed in the poor quality of services they gave me and I'll even take my services elsewhere because they expect me to pay for something I never wanted initially and the sim card I got is still not registered after almost 2 months 🚮🚮