Bad turn around issue still not resolved.

My car had an EPC error. I called my warranty service provider they referred me to one of their partners which unfortunately was Grease ****** workshop in hennopspark. I took my car for diagnosis and was told it's a thermostat and timing belt issue. I was quoted R10915 which happened after a week. When the qoute was sent to the warranty it had errors which lead them requiring to be sent a corrected one this took another week. When the warranty finally paid up it took another week to have the car resolved in that time I've been following up with them on the status of the car. From the 20th of July till the 14th of August that's how long it took to get everything resolved. My car was in the workshop from the 26th of july till the 14th of August. After I collected the car it had to go for a service it was picked up that the issue was not resolved. I took it back on the 27th August after another week of promises that it's been resolved I'll get it by end of each the day. On Friday the 30th I decided to drive to the workshop upon arrival they were busy with car I was adviced that it will be done within an hour I arrived at 15:30. Around 18:30 I was still at the workshop and the issue was not resolved. On the 31st I got communication with a qoute that I have to pay an additional R8000. Now my warranty term has expired and the cost come from my pockets which is something I explained upon delivery of the car incase they won't have capacity to have the issue resolved in time. After going back and forth my car is not fixed I am just getting bad turn around time and financial costs which are unbearable. It's been more than a month now.