Roca India / Parryware — Parryware tabs breaking out

We have installed all parryware products in our house and it has been 2 months only and 5 tabs are breaking out even the toilet seat is leaking. I did complaint in their customer service number but it has been a week and nobody came to check. Worst service from parryware. The first time their technician came we asked him to change all tabs but he didn't abd now this is the second time i have called them to complain.