Horrific customer service at Dstv Festival Mall

On the 02 May 2018, I took the explora decoder to DSTV Festival Mall, because the day before it was showing exclamation mark and wasn't working. So the lady who was helping me named Constance, said that what is causing the problem was the power supply priced a R350. So before I bought it, I asked if it wasn't the problem will I be refunded and she said yes.

Unfortunately it wasn't the problem, and I returned it. On my arrival, the lady (Constance) shouted at me and told me that I was not going to be refunded. when I asked to speak to the manager, the manager never come to see me.

I am disturbed by the way I was treated at this Festival Mall DSTV shop and now am stuck with a power supply which am not using.