I've gotten a really good offer to switch to my local cable provider (already have internet with them) and have set up an appointment to install on Friday morning, 7/12. Looking at my last D* bill, I've paid in advance for service up to 7/11/13. I'd like for service to be turned off at the end of the day on 7/11. Can I go ahead and call today to schedule service to be cancelled at that time? Is that a bad idea? I don't want to have a CSR who's having a bad day turn my service off immediately.