Refusal to exchange Device

I have a galaxy note 4 bought on contract from vodacom shop in january 2015. Some time in June my device crushed and was booked for repairs at the vodacom repair shop in Witbank. They replaced the mother board and after a 2 days, the screen had cross lines on display. I returned the device again for repair at same shop and the replaced the screen. A couple of weeks, the device started detecting that the s-pen had been detarched yet it was stil attached in its grove. Returned the device again for repairs and when returned same problem persisted.<br> <br> When i asked for a replacement, I am told that they cannot replace it. Apparently samsum cannot replace devices repaired at vodacom. <br> I believe this is not fair to me as a customer, because I cannot the enjoy the use of the device anymore as it is always in the repairs, barely 12 months after purchase, At the moment still pay close to r800 pm installment.