'Mistress Dula and her friends wanted to test this guy's pain threshold. They wanted to make sure that he could handle the pain he had claimed to handle. That is why they made him lie down and they then trampled the shit out of him. They made it worse for him as they went ahead to trample him together at the same time instead of doing it one by one.
Mistress Dula and her friends had an issue with this guy as he was a con. He had tried his best to con them and he nearly succeeded. But the mistresses realized that in time and they were not ok with it. That is why they chose to punish him. This was done as painfully trampling him with their high heels for him to learn never to do it again.
Mistress Dula had an issue with her servant and she wanted it to be sorted out asap. She did not like how he took things for granted and she felt that it all had to be sorted out. That is why she had to tame the servant using her high heels. As he felt the pain of her trampling, he knew he could not afford to ignore her anymore as it could get ugly for him.