OP sad to hear about your experience. I think no words are going to help in this case. You have decided to go public here, I am going to assume you have spoken to the seller and haven't found a satisfactory response.
FWIW would like to share my experiences ( they may benefit new members planning to use this forum to buy/sell equipment)
I have experience buying equipment from Mumbai (AN India) and one respected FM here who sold me a heavy tube amp no less from Delhi. I had to return shipment to AN India as speakers came in a very poorly packed box (without wooden create) the Crossovers were dangling inside; AN India obviously to their credit replaced the speakers. Now when I made my first purchase on this forum a KT88 PP from
@malvai , he packed them in a bomb-proof manner. Basically, the Amp was put inside the OEM package and then inside a plywood box. Despite not so great handling by DTDC I got the amplifier intact. I have since then bought DACs, LPs, and other stuff here (Delhi to Bangalore) and things have reached defect-free.
I learnt an important lesson from these experiences
1. Prioritize buying used equipment within your city
2. If buying used from a different city; do proper checks via videos and pictures (assume worse case and ask for information without hesitation) . Please remember all of us are buyers and seller at different points in time and genuine sellers never ever discourage inquiry and complete disclosure for none of us are doing this to make money.
3. Most importantly insist on bomb-proof packing i.e. wooden crates for speakers and Amps are a must; I say this even if OEM box may be new and good enough for sensible handling. We are still not a "developed" country and logistics business is not a huge margin business, expect that people working on the job are not well paid and have no incentive to baby your parcel. It costs a fraction of the product's cost to make a rugged wooden crate. Offer to share that burden with the seller and you can reduce the risk associated with buying used equipment in India significantly.
4. Finally there is always a possibility that a cosmetic defect or some wear and tear missed buyer scrutiny or the seller himself/herself forgot to mention it due to an honest mistake; I would say there are two ways to deal with this; some sellers offer returns within a stipulated period where buyer bears the shipping charges, it's good to discuss these terms before sealing the deal; I personally keep x% (where x varies per individual) tolerance (not money but, prepare mentally to uncover something that wasn't caught during checks) for such defects when buying used so long as they don't degrade functionality and aren't a huge eye sore.