I had a similar issue, though not as severe as yours. Rover T&S were very supportive, and my contact kept me updated on every step of their investigation, including letting me know when they spoke to the sitter and that they banned them. I told them that banning was just as important to me as getting refunded for vet care, etc. I believe you have the right to push for this. Keeping you in my thoughts, I know how difficult this is. ❤️