Pathetic Service

I bought a home theater system from House and Home Westgate branch on the 17 of August 2014. The system just stopped working on the 28/03/2015. I then took the amplifier back to House and Home Westgate branch on the same day which was 28/03/2015 and it was booked in by Laticia. After two weeks straight of not receiving any feedback i went back to the branch on the 11/04/2015 to find out what was happening with my amplifier and I was told that they would follow up with the supplier and come back to me between the 13 or 14 of April. Then on the 13th of April 2015 i received a call from Laticia telling me that the supplier has received the parts and they are repairing my system. I was then called by the same Laticia lady on Friday the 17th of April 2015 to be told that my system was ready and i should come and collect it. I went to the branch on the 18/04/2015 to collect my system just for me to be told that Laticia called the wrong customer. What irritates me the most is that they have wasted my time and money going to branch and that they do not even have an SLA as to this day nobody can even tell me when Will i get my system back.