Fight fire with fire mate. If you,ve got the balls, that is. These scumbags need dealing with AND FAST. Forget about reconciliation, think about YOUR future, use all your friends and friends friends, and use (threat of)violence and/or intimidation, like they have with you. As the Police point out, its a civil matter. These theiving foreigners need to be taught a lesson.
You must tell your solicitor that you signed over the25% "under duress or undue influence", let them take YOU to Court, and a Judge will throw their claim out, as the contract will be deemed not binding and therefore unenforceable.