I'm already a customer of theirs and will be buying another forum member's account if all works out properly.
He's a highly trusted escrow, make sure you contact the correct SebastianJu here: https://bitcointalksearch.org/user/sebastianju-18640
You're welcome but no sorry I don't have any experience with mining accounts or buying & selling them. First check it's allowed and can be done. Lot's of scammers about be careful.
Perhaps you can ask the question on the genesis mining thread: https://bitcointalksearch.org/topic/genesis-miningcom-worlds-leading-hashpower-provider-602022
Hopefully someone can help you there .