I worked!!! Looks like I be figuring this thing out!
Seriously, send them a check for say, fifty cents. By the time they open it, process it, deposit it, enter your name in the data banks and send you a thank you, they will be down at least five to ten bucks.
I had a dispue with a credit card company and closed the account by paying it $1.00 more then I owed them. They had to rebill me for a negative amount, send me a letter asking me what to do with the dollar and then finally they sent me a check for one dollar.
I hoped it irritated them, even if just a tad.