IMPERIAL SELECT SOLD ME A CAR WITH DEFECTS AND I CAN'T CLAIM WARRANTY

I am quite Disappointed with the quality of the Cars Imperial select sells to the public.

I am at a dead end currently with My Ford Focus 1.0 Ambiotte Ecoboost which I bought at Imperial select Last year February.

I went to do a warranty claim on my Ford and the feedback I received from Ford is that my car was bought with an aftermarket Clutch plate and when that plate was fitted it caused other damages that imperial did not check on before selling the car to me. Ford Barlowood found that The drive shaft inner CV boot has cable ties holding it in place. The drive shaft boot is leaking, Drive shaft seal is pinched, The gearbox oil is leaking onto lower gearbox mounting causing bush to soften, with a result of the bush cracking which is due to the drive shaft leaking. Upon my claim, they have advised that this has been caused due to the previous clutch repair. Which therefore forfeits my claim Valued at R8500.00

Why was I sold a car with drive shaft inner CV boot being held up by a cable tie?

Who is then supposed to pay for this when it was imperial that was negligent prior to selling this car to me?