Bad service at Suzuki Hatfield

I would like to lay a complain about Suzuki Hatfield. I took my car for service on the 22nd of January 2016. When I collected my car I realised that there was a funny sound when I'm driving. I checked the car during the weekend and found out that there was a cover that was lose under the car on the driver's side. I then took my car back on Monday and the Sales Rep : Anke told me to bring the car back on Friday. I took the car back to them as I was told on the 29th of January 2016. I received a call from the sales Rep Anke around 2pm telling me that they can't fix my car since they don't have the ***** to fix it. I couldn't understand why she's only calling me at 2pm when she had the whole day to communicate with me regarding the car. I then went to get my car. When I got there, Anke told me that she's sorry and that I must bring my car the next Friday (6th February 2016) since they need to make an order of the *****s that will fit in my car. I then took my car on the 6th of February 2016 as I was told again. Around 2h30pm I received a call again from Anke telling me that they can't fix my car since they don't have a cover for the car. My car is still not fixed.