My Warranty

I am looking for some advice on an A7 warranty .When i bought the car it came with an Audi 24 month warranty .The car had done just over 17000 miles and was bought from a main dealers in Reading .In May i was going to  my sons in Poole .The car came up with a warning light so i pulled over on the M40.In the car was my wife my disabled daughter and a family friend i called Audi assist who took 4 hours to remove us from the side of the motorway on a red hot bank holiday with a railway line directly behind us and the busy motorway in front we were also below a bridge that just amplified all the noise it was a very distressing time for us all and only got worse , my daughter was becoming more and more distressed we had no water and the heat was getting more unbearable eventually we were taken to a service station after 4 hours on the hard shoulder  . We were then another 5 hours at the service station  before i was taken in a taxi to Birmingham airport to get an hire car. To cut a long story short my car went on a low loader to Audi main dealers in Harrogate and we continued on to Poole a journey that eventually took 18 hrs.

4 weeks before the incident Harrogate Audi had serviced the car and sent a video commenting on what great condition the car had been kept this car has done only 29000 miles .The car has been with them now over 6 weeks it is in bits the whole engine is out It would appear that the engine bearings are the fault. The cost for the car to be repaired is £23000 the warranty only covers for £5000. When i bought the car i was told it had a 2 year Audi warranty but now Audi are saying it is in fact a VW warranty with a mechanical limit. At no time did any one tell me this and i have no paperwork relating to this how many more people think that they have proper cover ?? I am now been put under pressure to pay the £15000 difference the stress is getting to me and i am wondering if any one has experienced the same issue