I had MSI board for which the support center in Mumbai doesn't exist... they have to ship it to Delhi. There is no pickup service but have to go all the way to Lamington Road to drop it and they do not guarantee if the product will be repaired/replace or not. Regarding the requirements i have clearly mentioned an EATX mb, GPU RTX 3080 and i9 processor
The i7 was recommended to you because for the mentioned tasks, you won't need more. Office work you could do on a i3-12100. Gaming, especially 4k gaming, doesn't require that CPU, either. It doesn't even require the i7 since the GPU limits the FPS with basically every single processor in the consumer space. The i9 is wasted money especially if you also want a screen as well. Also, about the support. That's the situation for almost everyone on earth... it's your country at least, some have to ship overseas.
For the board, no idea what you want that overpriced thing for, but this is the cheapest option I found.
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GPU, unless it's some no-name China offering, everything goes, MSI, Asus, Palit, Gainward, EVGA, and whatever else. Pick the cheapest with support in your area. They are all good brands.