Hi I took my vw beetle to kwik fit for an mot and it failed on the cv joints. I agreed for them to fix it but then they phoned to say that they broke the subframe whilst doing it. They are now charging me approximately an extra £800. I am now wondering whether they are liable for the repair. They did warn me before taking on the work as they said it had happened to them before. Any advice would be greatly appreciated as I know nothing about cars, garages or how to fix them. Thank you for reading.