No Rain Internet like no rain in summer... It's killing us.

Three days without any internet, an online business that's bleeding money due to that, two calls and broken promises... That's what I've experienced over the last 4 days. In the last month and a half, 75% of time NO INTERNET, so I withheld payment, called them (two weeks ago) and they promised to sort it out, but I had to pay first, which I did then because I had 12 - 14 mbps speeds before (so long ago that I don't even remember it) and I thought they would come through...But Nothing. Everybody apologises for the inconvenience and escalates the problem (all the same like robots) and nothing gets resolved. I mentioned to them that I think it's my sim card that's damaged (from all the in and out from almost never working) and they are supposed to look into that, but over 24 hours since my last call and no internet, no feedback, no anything. I have a struggling online business and this is killing me. PS: My router, etc. works perfectly. I put my phone's MTN sim in and no problems. It has very limited data though, so I can't use it. That's why I pay Rain R 535 per month for WiFi service.