...Do you believe what they have to say?
You have to accept the fact that your coins are irretrievably lost. If you continue to look for similar services that promise you to get your money back, then you should be prepared for the fact that your losses will only increase.
In order for the OP not to lose more money in the pursuit of his lost money, it's better that he should accept the fact that he's been scammed and move on, although it's painful especially if the stolen coins is of high value. The way that crypto is structured, I believe that the moment another person is in possession of your seed phrase and moved your coins, it'll be next to impossible to recover it, so I don't really believe in these so called crypto recovery services, because I've never heard about anybody that they've helped recover their stolen cryptos.