They lost my tablet instead of fixing it. Now what

Ok, so I submit my tablet to get fixed the charging point, I submit everything.. I submit on the 30th of March 2015.. It was only supposed to take 21 days, we are now in day 58. I have been there 3 times to follow up and the last time I was called to come collect, I went there they tried giving me someone else's tablet.. I send them continuous emails wanting to find out if they found my tablet and they ignore my emails. So please help me understand what must I do now, should I carry on paying for a service I am not getting as it is contract, or should I cancel it or what.. Can someone say something from Telkom Mobile Alberton Asseblief... <br> <br> I must say, it has not been easy dealing with you, from getting the damn contract to now this.. hai this is pathetic