@NuuNuu Sorry for your experiences with IndiaMart. I can only say I still stand by my posting that there are some good vendors there. At least I know of two that are.
After ordering from one for 14 years I would say that's reliable, and having used the same class 4 medication for even longer, I believe I know the difference between quality and fakes.
What I think is that Indiamart is not regulated by anyone such as the FDA here in the US. I would say that many sites or false companies would use the organizations name to advertise their business.
Personally I could care less if my vendors are members of Indiamart so long as they are legit. I really can't even remember if my vendors were in Indiamart when I first used them.
Unfortunately you can't just go down the listing of companies and order from any one of them and expect to get a good result. I think you have to look at each individual vendor carefully, beyond the fact that they are in Indiamart, even pretend they aren't affiliated with it. Just try and do the same researching you do with any vendor you find and decide to try.
Hope you have some better luck in the future.