Our permit allows to add new 450mm trellis on the existing 1750mm fence, to a total height of 2200mm. After long discussions, we agreeded to renew the fence as the old fence was rot and damaged. It was not feasible to add 450mm new trellis on top. Our neighbor agreed and paid about one third of the cost and we paid the rest. But on completion of the renewal the neighbor changed his mind and filed a complaint to local council. Council stepped in and sent me a contravantion notice. Accused us no building permit. Is it correct by council?