My company sends me on planes to places all the time, I just do as I'm told. I don't start threatening to effectively go on strike, they'd telle where to go.
Thats neither here nor there. My company sends me all over the place too, and they pay for it, but that doesn't mean that it's right for a Football Team to say "we've accepted an offer, you can travel a few hundred miles to discuss terms and have a medical............... No wait, we've changed our mind. Your trip was pointless, come back, get the next plane if you can, we have training in the morning"
Don't think you'd be giving such sympathy if this was a villa player refusing to turn back up for work...
Dont think Villa would go back on an acceptance of transfer fee & then tell the player to get more money from them. Not how you do business once you have given approval for the player to speak to the club. If the player cannot agree personal things, thats a different matter.