I have been with DISH for 4 months. EVERY bill has been wrong. They have overcharged me for EVERY single bill...charges for HBO, other movie channels and protection plans that I had asked NOT to have.
They WILL NOT send you another invoice. They simply just tell you will have to pay the invoice and then they will credit the next invoice. Ok, so maybe the first time you would do this, but not on EVERY single bill.
The cancellation fee is $210 plus if you use the shipping label you have to pay an additional $17. If you have phone and internet and want to keep the same number you have to set everything up with the new provider and then cancel.