Router no internet connection and poor customer service

I have been struggling with network on my cell c router since 21.01.2021, even if I put the router Sim in a cellphone there is no network to hot spot the laptop, Since then I've called cell c probably 30 times, I spoke to a few technical department employees who tried to assist telephonically with no luck, on Saturday I received a reference number and was told someone will call me before end of day after 5 hours I called in to complain that I have been waiting for a call back I was told someone will call, I was then told to take the router to a branch, I went to the only cell c in louistrichardt this morning only to find that it is closed, then I tried calling cell c a woman answers and confirms my details then transfers my calls to the contract department were no one answers and the line just goes dead. I need help I have recently bought 50g data worth 500 and I can not afford to loose that.My router Sim number is *** router IMIE ***