I smell something fishy on the sender mate hindi kaya sila scam?

We could not help you kung hindi rin namin alam ang yung address kasi sa TXN na bigay mo I don't know if which address is yours and how much the amount they send.

You can trace that alone mate if you know the exact time

Edit:
I found out nag open ka pala ng thread regarding this matter, I think you should contact the Bitstringwallet.com support team.
https://bitcointalk.org/index.php?topic=5105158.0