Very Poor service and over charging

Our fridge gave problems the Friday night. Early Saturday morning we call Timothy, the owner, and he said he'll send someone just after 11 am. We waited until about 2pm for them to arrive. After they 'fixed' the problem, which was a re-gas and reroute of the small pipes, for which they charged R1700 (which we later found out from a bunch of other repair people, was way too much) our fridge again gave problems the next day. My husband let Timothy know, and he said he will send someone on Monday. Monday, I canceled all appointments and waited all day long (as they don't give you a time, or don't stay at the given time), but no one came. My husband tried to call and whats-app Timothy, but he doesn't answer his phone or messages. On Tuesday during the morning, I called the guy who worked on our fridge, as Timothy still doesn't answer his phone. The guy told me that he promise me he will come and fix it today, even if it means after hours. At 22:00 nobody arrived yet. Our food in the fridge started to rot already (who's going to pay for that?) And we paid R1700 for work (which when we described it to other people who fix fridges, said that they did a quick fix, and that they didn't even fix the right thing, and did work which probably wasn't necessary). And now, even though there is a 6 month guarantee on their work, and we already paid (over paid) for their service, and the fridge is still broken), we can't get hold of Timothy to get either our money back from him, or for them to come and fix the things that they missed, without charging us extra.