Asus Zenfone — In year two time screen pad stop working

Address: 411042

I purchased the Zenfoen in April Last year, but with in 6month stop working the Screen pad. Same issue raised in 11 Month. And service centre denying to repair because of following reason..
1) He required the TIN No of shopkeeper, Bur as per shopkeeper he don't have TIN no. Let me know is it my foul?
2) How can now i will trust that after repair it will work 6 month also. because last he repair then he run for 5 month.
3) instead of repair I need new phone.