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The lawyers on the site cannot act for you unfortunately.
A demand letter is never very expensive but tends to carry a lot of weight as no one wants to be dragged into court by a lawyer.
Generally once a letter is received the recipient becomes much more open to giving the sender at least part of what the sender is asking for to avoid court and legal fees.
So I suggest finding a lawyer local to you to pay for doing one letter and perhaps some brief negotiations and then if that doesn't work you have to decide then if you want to go further.