Ripped off by Upvote scam service

Last night i received these messages from Hive account@optimisticguy promising $5 dollars upvote for $2 sent to him, and claiming he is backed by 250 loyal steemians who will upvote my post. I sent 2 payments of $2 over 6 hours ago and have received no service.

I have looked at his account now, and am becoming worried that he is aiming to take a lot of money out of Steemit and leave without providing any service.

Could Hive account@sherlockholmes and others who care about the integrity of this platform, please try to stop him from leaving with the money?

Here below is a copy of the messages i was sent by Hive account@optimisticguy and a copy of a messages i have sent to him.

"
4 hours ago Claim rewards: 0.036 STEEM POWER
4 hours ago Transfer 0.001 SBD to optimisticguy Hello optimisticguy, i have sent you you 2 payments of 2 dollars and haven't yet seen the promised upvotes. Thank you for your service.
5 hours ago Receive 0.001 SBD from optimisticguy You Can Triple Your Money on Steemit. We will Up-Vote your posts for you. Send us $1 Steem Dollar our group will Up-Vote your post by $3.00 in return. So you triple your money. If you send us $2 SBD we will Up-Vote your posts by $6.00. Send $10 SBD and you get $30.00 in Up-Votes. Double Down! Send us $50 SBD and you get $300.00 in Up-Votes and for $100 SBD you get $750 in Up-Votes. We are a group of 250 loyal Steemians, we believe you should be paid more for your work on Steemit. Now you can get paid for your efforts. To receive our Up-Votes send $1 Steem Dollar to our group leader Hive account@optimisticguy and enter a link to your post in the memo section. We will distribute your link to our 250 members then we will start Up-Voting your post. Yes you will receive Triple your money back in Steem Dollars. Your Satisfaction is Guaranteed. Thank You Hive account@optimisticguy
7 hours ago Transfer 2.000 SBD to optimisticguy https://steemit.com/nature/@daydreams4rock/the-destruction-of-australian-marine-parks
7 hours ago Transfer 2.000 SBD to optimisticguy https://steemit.com/philosophy/@daydreams4rock/rockstar-philosopher-lao-tzu
7 hours ago Receive 0.001 SBD from optimisticguy Double your money on Steemit. We will Up/Vote your posts for you. For $1 Steem Dollar we will Up/Vote your post by $2.00 in return. So you double your money. If you send us $2 SBD we will Up/Vote your post by $5.00. Send us $10 SBD and you get $30.00 in Up/Votes. For $50 SBD you get $300.00 in Up/Votes and for $100 SBD you get $750 in Up/Votes. We are a group of 250 loyal Steemians who believe you should be paid more for your work on Steemit. Now you can really get paid for your efforts. To get our Up/Votes send Steem Dollars to Hive account@optimisticguy and enter your link to your post in the memo section. Your Satisfaction is Guaranteed. Thank You "

hello optimisticguy - i have sent you 2 payments of 2 dollars for your upvote service - i would greatly appreciate your completing the promised upvotes . Please let me know what is happening or return my money if your having trouble. Many thanks

I feel sickened to have to put this post up to warn others, and i really hope Hive account@optimisticguy completes his service or returns my money promptly now.

Please resteem this to warn as many people as possible, and it would be great if i could somehow earn my $4 back from the decent people in community through your upvotes.

Many Thanks- David