poor service

I bought an inverter on Saturday 25th Jan 2020 at the fourways branch. It then was giving me problems and I took it back on Wednesday the 29th. Unfortunately the service was terrible as I was made to wait and I was not given any paper work that the inverter was booked in. I was told that someone would call me to advise before end of day on the 29th and no such thing happened. I then visited the branch again to find out what was happening on 30 Jan, and the same terrible service was proferred as I was made to wait for John who took a long time to come back from the canteen. When he came back, I was then taken back to the refunds/return office and John then wanted to ask me the same questions I answered on the 29th and also I was made to wait forever. I was then given the paper work and again advised that someone will call me before end of today (30 Jan) and lo and behold noone has called. I am pretty upset for all the times wasted and no concrete solution given