So I did some washing, then tumble dried it. The tumble drier was playing up, not drying. I emptied the water and looked at where I thought you emptied the dust. Then I asked a MOS. She said "
No,
this is where you empty the dust"
AND afterwards it still didn't work
So I complained again and this time they showed me, for the first time since I owned a machine that as well as the water and the dust I also need to clean out a filter every month or so