Advice on fallen tree

So a neighbors tree fell into our backyard a week ago. My wife went round to talk to the neighbor (he lives on the block backing onto ours) and he was rude and disinterested.
Its pretty clear he is not going to do anything about it, or maybe has the means to, so what is our recourse? I’ve tried calling 311 but they just said its on private property so the city cannot help. Any advice appreciated.

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