So, is the neighbour still complaining about the noise?
If so it would be interesting to hear from other Flatchatters about possible solutions they’ve come across.
It may be worthwhile to ask for a noise diary and to compare their experience with your actually being in your residence. If there is a difference in times then maybe there is another explanation for where the noise is emanating.
It has been reported here previously that the residence above has been blamed when the noise came to the affected residence from another residence, e.g. beside or even diagonally opposite.