Bad service by clicks Manager

bought a SafeWay 4 bar heater 2 weeks ago at Clicks in Gezina Galleries. Yesterday as i was with my family we had the heater on then out of nowhere the heater exploded then started burning..the whole experience was traumatizing as this was the first time we have seen something like this. So today morning I took the heater together with the proof of purchase back to Clicks in gezina Galleries hoping to get assistance with and exchange as the heater is only 2 weeks old and it just exploded out of nowhere. I got there and waited for about 15min for the manager, so i explained what happened then immediately that guy was like "So are you trying to blame clicks for this? Are you saying its clicks fault? I have the same heater at home and it's working fine, you cannot blame clicks for something that was caused by your electricity " those were his exact words to me. I left the heater at the store as he said he is going to investigate i don't know investigate what as he saw how the heater looked..As a manager i believe that he might have went to customer service training to be taught how to speak to customers, that guy is so rude and has zero customer service s****s. When I bought the heater I was told to keep the receipt by the cashier in case something happened to the heater and I had to return it, which is what I did but I never got assistance all i got was a ruthless rude manager who knows nothing about customer services. He then called me to say i will not be getting any refund because what happened is my fault, it negligence. How pathetic is that, this is not my first time in my life using a heater. Their heater almost burnt down my house and this is what i get as a customer