aiyo... wats happening.. lets care n share, forum in a way are meant to share info and not to be personal.
In short, if one is comfortable dealing with the contractor, everything (be it pricing, designs or materials) oso can be discussed.
Its hard to be fully perfect reno, sure bound to have some workmanship not up to standard. Its all up to an individual tolerance towards the work performed. One thing i'm sure is, Tau will do their best to solve the issue, cos i have the 1st hand experience. hahaha...