OP,
What Optional is explaining to you is that there is a cultural and mental differences between certain countries.
In the US the term "self exclusion" is not that popular as it is in Europe.
Also in the US self-exclusion is not something the operator is obligated to pay for so if you lose they don't pay and if you win they don't pay neither (see post #17 here).
In Europe the term "self exclusion" is more binding and if an operator violates it he would be responsible for the loss.
Sportsbet.io is licensed in Curacao, the only one who can help you in Curacao is Game Protect, I have tried myself to contact local lawyers and advisors in Curacao, and got nothing - the only one I'd trust is Game Protect.
I wouldn't bother emailing
complaints@curacao-egaming.com although you are welcome to email them but they won't help you at all, none whatsoever. You have only 1 channel to try now.
The thing is you lost $1,000 - I am sure in India it's a lot of money but in Curacao or in the US this is a reflection of legal fees - maybe Game Protect would be able to help you for $400 - $500 - ASK FOR IT, don't ask us, ask the person who can assist you - if it works - great, you might get 50% - 60% of your losses back.
Another suggestion - keep your correspondence down to minimum, no one likes to work for $500 having to read a "scroll" i.e. a lengthy text that makes it impossible to follow up with what you're asking.
Keep it down to a minimum, explain the issue, and see if GP can help you for that amount - unfortunately I have nothing else to offer you to do, I understand you're annoyed but please also take this as a lesson for life and stay away from gambling, arrest the addiction and don't let yourself fall into this ever again.