Horrible service

I would not suggest Rain wifi to anyone, I paid R4000 for a replacement router and only received it a week later after forwarding my Proof of Payment to almost everyone in that support call center because no one sent it to their finance department. Since I finally received my router BUT now my sim is not working it has been 2 weeks now without any wifi and no one is assisting me, I've been calling 3 times a day without anyone doing something. This is the worst service I ever experienced in my life, how do they expect us as a client to pay our monthly installment if they can't do their part as the service provider.