Stolly, I am sorry to say this, but why did you imagine that this could be sorted out with a few 'phone calls? You should put everything in writing and send by recorded delivery - quite simply to protect yourself. Telephone calls are often ignored, but recorded delivery paperwork cannot be ignored. You need to stop talking to people on the telephone, and start creating a legal paper trail to cover yourself.
I suggest that you find out who the top manager is at Peugeot UK, and write to him/her (by recorded delivery) asking for help to reach a solution.