Tell them you're moving somewhere where they don't have service. When I said I was moving to South Korea to teach English they cancelled my contract with no hassle whatsoever. I didn't even know that applied and was expecting to pay an ETF, but I guess it's their policy. You can also terminate your contract if they make any changes to it whatsoever (increase/decrease a specific fee, etc, must be done within 30 days of the change).