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Hi thank you for your message, if he has damaged your property then you can bring legal action for the cost of repair, you can also bring legal action for the removal of any bamboo or roots on your side of the fence. You should get a quotation for the cost of repair but you can use the cost of replacing the membrane as part of this figure. You can also look to get a court order for the move of the fence back to the correct boundary and the removal of the slabs and concrete on your land. I hope this helps, if you can please accept my answer and rate me 5 stars (in the top right of your screen) then Just Answer will credit me for helping you today.