Dicey Fly by Night Panelbeaters

Took my car to them for a quote and explained what needed to be done. They said they could do the job. We agreed on a price and I gave them the go ahead to do the job. I told them they could take as long as they needed as I have another vehicle. Few days later they wanted 50% deposit as they needed money to pay their staff. My car was still being repaired. I made the payment. A few days later they told me my car was ready to collect and to pay the balance.I went to collect and then told them the job was not done as per our agreement. They told me to leave the car and they would fix. A few hours later they called me to fetch the car. Nothing was done to fix the problem instead they made the problem worse and damaged the paintwork of my car. They told me they couldn't fix the problem and became nasty and said I must take the car away.