Inconsistent Customer Service

Having continues problems with the mentioned dealership in regards to the servicing of my Caddy. I have a Warranty plan and it seems that this is the problem, as I have paid for a two year plan, in 2021. These past two years having taken my car regularly there for servicing etc, and had most of the times given wrong information, and continues delays in getting the job done. The last time (earlier this year) I took my car as the windscreen sprayers did not work....wow did I have the most annoying experience. I got a call from the Service Department advising that I could collect my car that it is fix. I did so, just to be told by the Sales Consultant, that this was not the case as the car has to overnight and has been taken apart so that they could get to the source of the problem. I left, returned the morning and my car could be driven, I asked to speak with the Manager and explained my situation and concern. I asked for an update on whether the problem the car came for was fixed or not? He could not answer me. I took the car as this is the car I use to Transport scholars etc. I returned the car after my morning drive, but tested beforehand the issue that the car had, and boom it seemed to worked. Upon returning the car to the same Manager, I advised of my finding......He was more surprised than me as their records reflected that the problem is still being worked and once they know what it was, it will be fixed. Until today I had no answer to this. I asked than to have the car serviced, and as soon as the Service Consultant noticed that there was a warranty plan on the car, they could not find a day to slot in the service request, this was after they had already given me the date for the service. Yesterday, I called and asked for an appointment to service my car, as it was due. I, was given one for Tomorrow, and boom later the afternoon the Service Consultant called advising that the service (major) can only be done the 1st or 2nd November, this is when the Warranty expires. I mentioned that unfortunately, this is our business Transporter, hence the service can only be done during school holidays. I asked that the Branch Manager call me back and am still waiting. This is just 3 challenges during this 23 months that I have experienced with the said branch. There is so many others that have left a bitter taste in my mouth. I need to be called on *** as I will take this matter further with VW CEO, Martina Biene who might be more willing to appease their clients. Thank you in advance, Cara Thomas.