Hello Big Steve
Welcome to EOS
Have you got the keys & Escritura for your home?
I ask because if you do, although it was very late completing, I thought the deposit formed a part of the purchase price?
Therefore, why should you be able to claim it back?
Surely compensation for late completion would be the route to go down?
There are Lawyers here on EOS who will answer your question in a legal light.
This is just my take on things.......
Regards,