[Designation of addressee]
[Name of Development Company]
I am writing this letter to register a complaint about poor quality building materials provided by you last week. We have been buying materials from you from a long time but never faced such kind of problem before.
Recently you delivered us [material details], that is very poor quality. If we continue the construction work with this poor quality material then it is going to damage our goodwill.
We will be having more of your material in the future but that now depend upon your action on this problem. I hope that you will take immediate action to insulate this problem that we are facing. It is also requested that provide us the material in time as we cannot afford to slow down the progress of the project. I would appreciate if you could organize to fix this problem correctly. You can contact me on (phone no.) to arrange a suitable time for the repairs to start. As we are facing the lack of quality problem, we need this to be resolved by you at the earliest.
Looking forward to a quick action in this regard from your side. Thanking you in anticipation.