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The steps you have done it are the right ones, to contract a solicitor who demand him
Once the solicitor has demand the money out of court you have only the legal way in court
It will be not easy to manage as long as you have not your copy of the contract but the solicitor could demand with out it
So, contact again with the solicitor and contract him to demand your money in court
No more ways to manage it
I will be here if needed, thank you