Important Note:
The current Seasonic distributor for India (Tirupati Enterprises) is only honouring warranties for those units that are purchased directly from them. As of now, many dealers have reported that they are either not honouring warranty for Seasonic units distributed by them by creating some hassle during RMA process and referring them back to the dealer. Long story made short, they are making dealers to discourage them from selling online, though some stores have said that they're doing the same with physical stores who have their own site for selling online.
Why do they do this? Why doesn't Seasonic intervene? Unfortunately that's a question for another day. Simply put, unless you purchase from them (overclockerszone) you will end up facing hassle at some point. This has been happening for a while now.
As of now, stick with recommending other brands- Antec, Coolermaster, etc. Note that VS, CX and RM series should be avoided as of now. Note that reviews under certain series are advertising power supply reviews based on initial design/ components on first model. There is a level of bait-and-switch of components are happening along with newer rev, even changing OEMs at one point. Check the actual model number mentioned on the power supply reviews (on the pics showing power supply labelling). No issues with AX non-i series that I've heard so far.
Thermaltake is rumoured to be handled by Acro Engineering, but I am not sure of the RMA procedure and the reputation of Thermaltake PSU. I believe toughpower is a good option. I've also heard Antec switched to Acro Engineering, so available should be as good as Coolermaster IMO.
If you're buying from online marketplaces like Flipkart and Snapdeal, make sure its from 'overclockerszone'. You can always buy it from their website overclockerszone.com or something like that.
BTW, What about Seasonic in small cities/town?