Royal Enfield — purge valve problem in classic 350

Address:

Pune, Maharashtra, 412308

Yesterday i faced a problem with my bike, the engine used to go off in running.
I though might be due to some dust particle or water in the petrol tank.
I gave my bike to the nearby royal enfield service centre (Brahma motors, wakdewadi, pune), where the service advisor told that he will clean the tank & the carburetor. While doing the service the service advisor found that the purge valve has got damaged/dead, i was told to replace it with a new one. While picking up my vehicle from the service centre, i asked the service advisor for how the purge valve got damaged/dead, he replied that you have filled the petrol tank full because of which the purge valve got damaged/dead and this problem is with all the classic enfields, if this problem is with the company why cant they resolve it & why are they charging money for the same.