When you call the number, it asks you to press a number before you enter your fax # for deletion. But when you call a second or third time, it asks that you press a different number for deletion each time. So...in order to *really* delete your number, you have to call several times and cycle through all the variations (press 1, 2, 3, star, pound....etc.)
This number sends me unwanted faxes early in the wee hours. I've asked for my number to be removed 6 times. I've started calling the people who use the service to complain.