very sad it happens first of all.
I have been buying stuff from bilal gunj on a regular basis from 2005/06. Not even a single time i get a faulty thing, may be because of the exuberant amount of interest in automobiles. By the way, i have seen crooks like you faced on every second shop. Most sadly this aspect that a haji sb is sitting and rounding tasbhi was a sign of purity in ancient times...not now. sadly.
Yes, there is a union leader in bilal gunj. First, please go to him for the matter, he will surely do something about this.
Please update here regularly. As i know many shopkeepers there, may be i can get something for ya.