Router purchased after promised coverage in my area. No coverage. No assistance from Cell C.

I purchased a ZTE Router on the phone when a Cell C sales person assured me that it would connect in my area. This was in July. I told her that we had no network coverage for Cell C in our area but Cell C promised that connecting would be no problem. The Router didn't work from day 1. I have been consistently calling Cell C for 2 months trying to resolve this issue. I got shifted from one department to another, countless reference and case numbers and no assistance at all. In desperation I finally went in to the actual Cell C store at the Mall of the South so that I could speak to someone face to face. I spoke to a consultant who tried everything he could but finally suggested that I return the device because it would not work. I called cancellation services but was informed technicians first had to come to my house and check for themselves that the device wouldn't connect. Nobody came, nobody called. The money was deducted from my account for 2 accounts. The one for the Router and the other for an account that the original salesperson had opened by mistake?! It was also supposed to be cancelled. This is the first time that I have ever bought anything from Cell C so I have been super polite, trusting and patient during the whole process. I will take this as far as I have to now because I am beyond angry. Never again will I trust this company.