LadyGascoyne
Still Fig-uring it out...
If the only option the OP wants to pursue is sending the horse back, then they need to a solicitor not us and prepare for an expensive battle with no guarantee of money at the end.
I don't think we could have made it clearer that it's going to be a painful situation and no one here would pursue it.
I also don't understand that energy and money could be spent on that course but not on training the pony. But I guess that's choice again.