Nothing done regarding conflict incident

On Thursday 26 October 2017 I was at mygym wanting to use the Smith Machine. Two other members had been occupying the machine for at least 15 minutes. When I asked them how many sets they had left I was told 16! I asked a staff member if this was allowed and when he requested for these two members to move on to give others a chance they told him they now had 24 sets left. Later I asked these two members how many sets they now had left and they told me "we would talk about it later" - which was clearly meant as a threat. I took a photo of the two members and posted it on their Facebook page. It was removed and I again reported this whole incident and mygym has decided to do absolutely nothing about it.