Getting noise (Heavy foot sounds) from top floor in apartment

Sir, we are getting lot of noise from my top flat interms of footsounds.not sure what they are doing in their falt. We showed them once and they agreed to go for Mat but till now they have not done. Oneday they agreed to use slippers and followed the same for 1 month and leave that as well now. we have facing this from last one year (bought the flat 1 year 6 months back). Initially everything was good. later on they slowly started the things. we told somany times with assiciation memebers as well. But when we tell for those 2 days we will not get any noise but later it will be as usual. When we ask them they are coming back and saying what we need to do without walk and they blamed us that it is your flat issue. Oneday, we called Senior civil engineer to get suggestion for remedy. During that day, we went to their flat and asked them to do the walk, but we are not getting any noise to down flat. which means what i feel is they are doing intentionally. Informed to association members and they also told them somany times but still they are not realised. Looks like they fell that its my flat who are you to come and say like that. My thing is, why should i suffer from them. Please suggest on how to proceed on this.