Fishy accounts management and awfully slow respons...

Fishy accounts management and awfully slow response on inquiries. I stayed here for a conference for three days in a prepaid room shared with one of my colleagues. We were asked to place a credit card for incidentals and he used his; the next day his credit card was compromised with several dubious charges on his account. So we switched to my card and there was a $600 charge which I expected to be revoked after check out. After several phone calls and emails with my bank and the hotel the issue is still unresolved.