Its really sad as you lost. in the past day i also caught up in a scam , and someone hacked my account, as i import my wallet with private key, now my wallet has gone, all the tokens he transfer in his wallet, when i tried to transfer , suddenly my eth lost( mean he is working through bot ) . and this loss is bigger than your one .
Be careful from scammer as well .
in your lost show them numeric phrase . or try to install in another mobile and then again import , its just to check out is it really a fault in there system or not ?
May be this method works for you.
Thanks