Sorry for your loss of funds. The blockchain has to have immutable features or it would lose a huge amount of its value and appeal. Once I sent 20 Zcash to my Zclassic address on Bittrex. It's worth $5000 at today's value. Gone forever, or at least until someone cracks the private key with a quantum computer or something.
For future reference. I'm offering a better lease rate on SP than minnowbooster. I have leases of 45.45 SP per STEEM per month.
Thanks @robert-call; yeah, you are right; I mean you can change a post up to 7 days after posting, but you can't change transfers. That's not the way it should be.
Sorry for your loss too. That's a huge amount.
Thank you for your offer; at the end of the day I am happy about my mistake; without the mistake I most probably wouldn't have known about your service, which is very appealing.