Worst Service at Renault BB Hatfield

I received the worst service ever at BB Hatfield Renault. I took my car for maintenance of the turbo on the 24 of October 2018. I only received it back two weeks later. This is after I was told that the job will be done after a week. I would call everyday making follow ups and would hear different stories every time. The first time I called to make follow up I was told by Kea ( Renault representative)that they have been trying to call me but couldn't find my cell phone numbers. Which I found to be so unbelievable cause I have been taking my car for service to them for almost 3 years and they would contact me using the same cell phone numbers. Even before I took my car for the turbo maintenance, they called to remind me that I need to decide on a date to book my car. But somehow now they don't know my cell phone numbers. So kea explained during our telephone conversation that in fact they were unable to work on my car cause they were looking for the service book. The service book which has been there in the car cabin and they failed to first check the most obvious place

after that horrible two weeks of back and forth now after I have received my car I am told they made a mistake by releasing the car without me making payments. I was never told that I needed to pay money for the service as the warranty will cover it. But now kea again calls me to say they made a mistake and now I needed to pay R2000 for the work that was done. I mean how is that my problem? I am so unhappy about their service to say the least