I had faced a big loss on 13th April expiry, thanks to @ShoonyaApp fuck up.
I recovered the whole of it, and here is how you can try to fight your case:

#Finvasia #Shoonya #BrokerDown

> If you are ever facing technical problems with your broker, make sure to record your screen, take screenshots of the error, running positions

> Collect Financial ledger information, End of Day derivatives positions as per the Back office reports and also as per the app GUI

> Document everything, as elaborate as possible. Here is a link to my complaint document which I made against Shoonya :

drive.google.com/file/d/1Q8kYrX…

> Raise a ticket, start communication with your broker wrt the issue, Keep these in cc

[e-mail], [e-mail]

> File a complaint on NSE Investor welfare site:
investorhelpline.nseindia.com/NICEPLUS/

> File a complaint with SEBI on scores:
scores.gov.in

Once these things are done, you can at least be assured that you have done your part and wait for a reply from the broker

This is the best we can do. Nothing is full proof. I really hope this helps you get your money back from the broker. Procedure, help with the document, special thanks to
@WantedSyed @pythontrader999

Tagging people for wider reach
@khanzubare @sujal_modi1 @AlgoOriginals

@vamshisharan @krishstocks @satire365 @nitishnarang @BandiShreyas @mohitsharmadl @bhaveshp1509 @vivbajaj