Waste Management Charging for a dumpster that they will not remove Pittsburgh Pennsylvania

Waste Management delivered a dumpster and, when called to remove it, refused to and are charging daily. They say that the ground is too soft, though there has been no rain or snow in the area for over a week (unlike the day they delivered it, when it had rained a few days before). The driver didn't mention that removing it could be an issue (understandable, as it is in a highly accessible area). It could have been left literally anywhere in the yard, closer to the road, or in the neighbor's paved driveway. When I called to ask what could be done, I was told that the online form warns that they can leave it on your property indefinitely (and charge indefinitely), if they have trouble getting it out...which is entirely at their word. I am beyond frustrated, as I am now paying daily for something and have no idea when they will decide to remove it.