hd pvr faulty hard drive

I took in my insured hd pvr 2p to Umhlanga service centre on 31/3/2015 As it was overheating and had an error code that could not be cleared after 30 minutes on the phone. Good service.. swapped with another repaired unit. Go hm, connect up and Hard drive failure. Call in.. told to take it back in. Being a busy person, I was only able to go in today 8-4-2015. Tested, reformatted drive.. seemed to be working. Good service from Siya. I got explora too, connected up everything for me. Come home, connect up and both decoders working, but alas the hd pvr again has faulty hard drive. Call in again.. told to walk in. Went into multichoice Smith Street as it was closest. So second time today, and faulty pvr this time is exchanged for another repaired unit (3rd one). Come home and now its not communicating and explora has no service! Call in again, after 52minutes of troubleshooting, explora works but pvr still cant get signal from primary explora. Problem is that there is no other recourse but to continue taking it in with trial and error of repaired units. Nobody will collect the faulty unit. When is enough enough? It seems the last agent disrupted all settings on my account.