Fast initial response, but fridge still doesn't work AND they have my money, so are ignoring me.

Friday 31/8 around noon, I called Wellies as my fridge wasn't cold, even though the motor was running. Within 15 minutes I was called by Francis who promised he'd be around that same afternoon. He gave me full details on the phone regarding call-out fee, payment, etc, and said he'd contact me 20 minutes before he got here. He did indeed contact me later to say he was on his way, and arrived on time. He then explained that he needed to flush the system and then re-gas, and it would cost R1450. I told him to go ahead. When he was done, he explained that the compressor was hot from running without gas, and I should leave the fridge off for an hour, and then switch on. He said the work was guaranteed for 6 months. I paid him in cash and he said he'd email me a receipt. I waited an hour, then turned the fridge on and went out. Four hours later I came home to a fridge that was still warm, and a horrible smell of gas. I sent Francis a message advising him Nd he messaged back assuring me that the gas was completely safe and not flammable. I said I'd call him the next day about the warm fridge. Saturday I tried calling him but there was no answer. I left the fridge on - After all, it was now fully gassed. On Sunday I smelled the gas again, and then the motor stopped. Sunday evening I messaged Wellies on their site asking for help. Monday morning I called them, and a man said he just got my message and they would get back to me. I messaged them during the day on Monday asking either for help or for my money back by 6pm. It's now Tuesday 9am. And I have not heard another word from them.