Worse service I ever experienced from cell c

I have a cellphone contract and it is insuranced with cell c,last year I lost my phone and I need an insurance to pay it took weeks for them to replace the phone saying that they don't locate the Sim card on the phone reason was the network problem cause sometimes cell c doesn't have network coverage in my area.they ended replacing it, funny part of it was the phone that I was using had dual Sim card and the one that they replaced with it uses one Sim.i used that phone for 3 months and started to have network problems,now was the phone not Sim card cause I was changing simcards to see where's the problem,all to find that is a phone not Sim card.i have been calling cell c customer care since this problem they have been transferring me to different departments but not getting help.i even went to the store Alberton and new market stores no one is willing to help me..I trusted them so much with their service and product but the rewards is just disappointments.am so frustrated because am just leaving with a dead phone that am paying every months.cell c you are just bunch of disappointment your service is too bad what you know is to debit money month end you don't care about your customers.am not happy at all with their service.