***Update***
He received an email yesterday informing him that what he suggested was unacceptable and they are now going to automatically charge his credit card the full extra amount on the 16th!
He replied via email requesting them not to withdraw any payments as it's unacceptable/unauthorised and to send a qualified/insured engineer round to remove the card and give him a full refund.
Tell him to get in touch with his credit card company, explain you are concerned about the threat of a fraudualnt transaction and let them get in touch with them
