Possible scam exit. Still haven't received about 5btc
You removed the addresses, so we can't help you much here. How many confirmations are there for the transaction you sent Bitcoin to Sinbad?
I also suggest that you go to their official Telegram channel and ask this question.
https://t.me/Sinbadio_EnglishOmg, there is several receiving addresses, 2/3 - ok, 1/3 - not ok.
Do you know their official email address?