Okay, so if I grasped the situation correctly:

1. Sergo claims to be an exchanger that will exchange your PM vouchers for BTC
2. You guys reach a deal for exchanging PM vouchers on telegram
3.  You send him your PM voucher via Telegram
4. He promises to send funds, but never does.

Is that what happened? The address that he was supposed to send to was this: https://blockchain.info/address/3QrEKsdTpH1REbrVXyfqvZbGxSErxXzrSg, correct?

You should have never sent money first to a Jr. member with no reputation, especially if it's $400... Take this as a lesson.

BTW, please delete the last post which had the correct format and instead, update the OP with the correct format. Try to make it nice and clear instead of chunks of text which is hard to read, so that he gets tagged as soon as possible and doesn't affect more users.