Rain is crab and resolve this issue

Some time last year Rain had a R1 promotion. And I got the offer. Then within a week, there was no network and I kept calling and was told to move the router and put it by the window which I did but still then they kept saying it is the weather then blamed it on the area. As if I would move office because of Wi-fi. Then within the 2nd week, I canceled their service and was told that they will come to collect their sum and router. Which they did. Am now surprised that am receiving smses saying that I owe them R2200. How so when their network never worked and I had to cancel and move to another network. Worse I did not even get network not even once for the whole day? I was the one calling and they even said that they will send a technician which never did. When I asked where can I locate their office they said that they work remotely? Worst service provider ever and **** too