Bad service from cell c vaal mall

Goodday I opened an account for wifi at the cell c vaal mall branch they gave me a cell c black box as a gift as i want to activate it it gave me errors so i went back to the store with the black box the sales only explained to me how to reset the box went home and did as he says the box was still not working so I phoned again and all the sales can say is they need to send it in for 4 weeks and see if they can fix it not anything of exchanging for a new one or try to satisfy a customer because this is a problem from their side and now i have to wait this is poor service i hope i get feed back because if this is how a customer gets help i will never renew my contracks from them..jonathan