He said he will introduce me to another broker where his signals works with 98% accuracy and he introduced me to traderadvance.com,
This was your mistake to deposit fund in a unknown site. There are many scams trading platform and exchanges who will never return your money.
Mind you and take note that this new person he is introducing you to, is still the same person scamming you, that's how they've been operating making you thinking they are of help to you while they are all aware of everything happening to you. You might be surprised they spent a lot of money developing a site that's somewhat look expensive and seeming to be too good to be true, but they all have a target to reach for them to exit out and close down their site, next time you could possibly use this site to check fake domain.
https://www.whois.net/