The first thing i would do is get advice from the council. If the advice was not to my satisfaction i would then block them regardless. Your situation is totally out of order, unlucky you have to experience rubbish like this.
As to the fence it is mine as its on my land ( garden ) and i had no choice to put it up as when we were on holiday his kids aged 16 and 18 were in my garden playing football with my sons goals !!!
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