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I have not received my bitcoin to the bitcoin address I have provided for exchange of steem yet. It's more than 6 hours now. What should I do now?

I received your email that the bitcoin did show up in your wallet, just replying here for anyone interested in the outcome.

me as well, if possible just refund it back to my steemit wallet this is the memo I used to send 5 SBD 66a2843f-2f41-4379-bb50-a470ebf1047a

The bitcoin was already sent here (it has 58 confirmations currently): https://blockchain.info/tx/0e1f30042b706f2872db6293d4dc8f843faa8ea4fe46151824aa104544ba58cc
If you don't see it in your bitcoin wallet, it's probably out of sync. If you're using an exchange, check with your exchange provider.

Also, please use our email support address for support issues, it's answered much more efficiently reliably than posts here.