Motor plan

In 2013 I bought a vw polo gti DSG, the same year it was hijacked , and the hijackers crashed the car , I had to fix the car my self due to decline of claim from insurance, I have done 3 services with vw and and some miner things without paying , last year my car started having engen problems I took it to Vw, Where they confirmed my car still have warranty. Then I booked for the car in , after a while they took the car in workshop and checked it .only to tell me that they can't do anything on the because it was once in an accident. My question is why did vw wait for this long to can cancel my warranty and service plan ? Was it for the money? Or what