Brand new 7' tab .. 7 week's in repair centre already

Hi. I purchased a 7'tab from MTN 20 th September 2017 Harrismith branch i purchased from was not opened on the 24th and 25th September so I drove over 50 kilometres so I could get the Seventh-day exchange ..but the branch in the mall did not have stock in Bethlehem they gave me an option to give the unit in on that day and the Tuesday 26th September I would get a new unit my concern was that I was driving with 3 kids with no cell phone. So I had no choice but to go back to my branch in Harrismith when they were open. when I went to the branch on the 27th of September they had explained to me that they cannot do anything as their system would not allow them to record the return within 7 days so the consultant did not explain to me that the 7-day would fall away even though I was at another branch and they had no stock the branch owner at that time refuse Point Blank to accept the fact that I was at the other branch in Bethlehem to do the exchange And they asked me to give in the tablet The consultant is absolutely full of excuses.. 99% of the time doesn't get back to me.. I was asked to speak to different managers of the Freestate area are they were emails sent out and to date no one knows what's happening with my tablet. there has been email sent out as well as communication sent through there is hardly any communication back to me, unless I contact the managers or the consultants they after-sales is terrible they promised to get back to you and nobody gets back it's really really frustrating. I contacted the repair centre today they said that my unit was dispatched on the 3rd of November unfortunately nobody still knows what's happening with it . I sent an email to the repair centre that I was forwarded from the Harrismith branch and I also copied the Harrismith assistant and the branch manager. I left a message with the repair centre to get back to me regarding the email.. they have not contacted me.. on Tuesday I got a call from harrismith branch my tab is service. When I pick it up I see I've b been replaced with a refurbished tab, the keyboard still does not work and the SIM card is not activated ... yet the consultant says that it was activated by her. Melandri stated that she contacted the manager and he will sorry your the keyboard out for me I copied the manager Dries and melandri with an email on 22 November with the faults and im also asking now for a refund.