Royal Enfield — Chains pocket teeth damaged

Address:

Bardhaman, West Bengal, 713212

My 350 classic black re just reached 15000km that i had purchased on october, 2015.
Last day when i was cleaning my re, i noticed that more than 10 teeth are broken. I mainly wonder because i used to follow servicing time period (Last @ 13095) properly and i personally clean and lube chain every 2nd and 4th sunday of the month. A
I know very well that parts are not made for lifetime but these should at least last for good time frame. As per the brand i. E. Royal enfield, its major part's strength and quality should maintained thus way that these will not damage within a year or after running few km.
I have shared my disappointments. It would be great help if you could answer in this context.