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2 minutes ago Received 0.001 STEEM from tipu @tipU: withdrawing your STEEM deposit.
2 minutes ago Transfer 0.001 STEEM to tipu withdraw

Please tell me what to do now. I'm very worried

Received 0.001 STEEM from tipu  Sorry, you have no deposit made to @tipU. Please contact @cardboard if you think this is an error.

and where can you see your deposit?

I don't know...
December 3, 2021... 18.3 Hollywood Time...

And how do I get my 8 SBD back?

I wish you luck, but you may never see that 8 SBD's again...
December 3, 2021... 22.9 Hollywood Time...

And you do not happen to know how to contact @tipu?

Click on their Wallet, than Click where it says Blog... Then you Click on their most recent post and send a reply... It's a shot in the Dark, but it's probably your last hope...
December 3, 2021... 22.9 Hollywood Time...