Sorry about all the terrible replies...just google "RI Tenant-Landlord Handbook" and have a quick read. Here is the section that pertains to you. If you pay rent on a monthly basis (like most) then you are on a "month-to-month" lease. You must give 30 days notice, which it sounds like you did. Worst case scenario is that you pay through November. Don't let them bully you into paying anything more than that.