POOR SERVICE DELIVERY

In October 2015 I bought a Samsung Galaxy Tab 3 from the sales consultant telephonically, In November the Tab started to give me network problems, or just go straight to voice mail. In December it just went dead while I was busy reading my massages. I quickly went to MTN Waterfront to show them, the consultant that helped me needed all the items that came with the Tablet including the manual book, which I did not have, so he recommended that I should go to Samsung since I don't have everything. I took it to Samsung store in Waterfront and they book it in for repairs, it only worked a day and switch itself off while I am busy on the phone, and became worse than before, I went to MTN Waterfront again and the store Manager said I should go back to Samsung, I told her that I have a contract with MTN not Samsung they need to resolve this between the two of them, she said she will escalate the matter and somebody will call me, till today I am still waiting for the call, What so sad about this is that I am paying for a device that I cannot even use, the internet is not even working it's just useless, sometimes it just goes off for the whole day and work a day after. This is bad Service.