Bad customer service

I got my Samsung Tab4 in Aug 2014 and since February 2015 it just does not want to charge. The shop here keep sending the tablet in for repairs and it keeps on coming back saying there is nothing wrong with the tablet. The repair shop made me bought a new charger even and just to show them that it is not the charger I left the tablet for one night at the Autopage shop here in Potchefstroom to charge. The next day it was still not charged. So they sent it in to the repair shop again on the 10th of July for the 4th time with the same fault. Yesterday, Aug 5th, 2015 I went to collect it from the shop. The report from the repair shop said there is nothing wrong with the tablet, well it still does not want to charge. I am feddup because I am paying for the last 5 months for something that I cannot use.