Dataflow Stuck on Refresh, Cancelled the Refresh But That Got Stuck Too

I have a dataflow which contains Calculated Entities (using data from Linked Entities) all from a Premium Workspace. The refresh of this dataflow is stuck for hours so I cancelled it. But then it got stuck in 'Cancelling Status'. Due to this, the Source Dataflow (which contains all my 'staging entities' are now in locked status so I can't refresh it (error below). Any ideas to get this reset?

There was a problem refreshing your dataflow. {"RootActivityId":"589625f5-4b80-2435-f312-37fa71349f76" "ErrorMessage":"Cannot acquire lock for model 'c4143861-9f5f-4308-98af-847e1302edac/1690b4e4-ff3e-4e3b-87f0-9804f78922a4' because it is currently in use."}