Early termanation fee

I'll never get dish agine they are crooks they changed my due date causing me to pay many many $9 charges so they didn't turn off my service they changed my bill due date with no prior notice just a sorry for an inconvenience this may cause email I call to cancel and they want$300 yet there company said $20 a month cancelation charge but I only have a year left witch only equals $240 this  so horrible I WILL NEVER HAVE DISH AGAIN THEY ARE A DECEITFUL DECEPTIVE Company BOO ON YOU DISH