MNT bad internet

Hi all, im experience a bad service with MTN. Last year september I took a wifi home router with mint for my house. I was told that I'm going to pay R400. Month I was debited 6 hundred and something wich I didn't have in my account as I was expecting to be debited R400. After failing to pay that R600 & something mtn deactivated my internet, I spoke to an agent that told me I owe mtn so my internet won't me activated, end of October I received 1 thousand n something invoice staring that I must pay for my initial contract including the prorater of 6 hundred n something plas my R400 on internet that I've used in October. When I call mtn 135 number that takes2dsys to be answered and explain to them that I can pay R400 n something of the internet that I didn't receive in the month of October then they activated my .MTN router. End of December I got another invoice that I must pay R420 for the month of October, I called and disputed that invoice then my internet reopen again. 16 January 2023my internet was deactivated again and when I ask they tell me it's that R420 I didn't pay for that October month when they deactivated my account. Now I have no internet n they don't want to activate it or come and take it. When u try to get hold of them on that 135/6 number that is always busy u can't get hold of them it's just a waste of time.all. All I want is a brand new router or They mas come n collect it, thank you.

Mr KM Ramela