Dish Network--Satellite TV fraudulent charges; incompetent Sanford Florida

I terminated service with Dish Network (service was in my name but my grand-daughter's home) because the family had to move and was unable to use the service any longer. I spoke to a rep on the phone, telling them the circumstances.
I was told that we needed to return the equipment--2 converter boxes and 4 remotes. They were to mail me shipping containers (boxes) to use to return the equipment to them.

I just received a credit card statement from CapitalOne that included a $600 charge from Dish Network. When I called Dish Network about this, I was told that it was a "batch charge" related to equipment that had not been returned. (Can you say "b_tch charge"?) When I told them that I had spoken to someone about said equipment and that I never received any shipping boxes, they said the boxes had been sent. The address they sent them to was not correct. The rep said the $600 charge would be credited when they received their equipment.

That charge resulted in an overlimit fee on my CapitalOne account as well as returned charges on at least one recurring service that is charged to that account monthly--I'm sure there will be others. And I will be charged past due and overlimit charges repeatedly, as I don't have funds to pay the CapitalOne account down to the allowed credit line.

Not only did I not approve this charge, but there is no way that the equipment is worth $600. How can they just arbitrarily charge an exorbitant fee like that to a credit card account? Surely that isn't legal. I know it's not ethical.

Grammy
Orange City, Florida
U.S.A.