I too have just cancelled a Wal-Mart/Netscape Internet service, after figuring out that the phone number on the credit card statement has a "0" instead of a "1" in front of it. They tried to talk me into just suspending my account for a few months, but I was very clear about cancelling and got a confirmation number.
Just to be safe, I will also call my credit card company and tell them to refuse future payments to that account. Speaking of confirmation numbers, when I had a Wal-Mart credit card, I always paid my bill either before the due date or on the due date. If it was before, I would send it by U.S. Mail and if it was too close to the due date, I paid it in person at Wal-Mart.
Suddenly I start getting calls 7 days per week, from 8:00 a.m. until 10 p.m. from Wal-Mart telling me that I owe them better than $1200.00. Knowing full well I did not owe them one cent, I tried to give them all of my "confirmation numbers" off of my statements and receipts, showing that payment was received. "Well, we don't show that on our files!" I'm sorry as I can be that you don't show it, I have in my possession your statements showing you in fact did receive these payments and then they started the "hanging up on me" tactic also. They had the audacity to turn me over for collection!
I told them to prepare for court because I was going to fight this with their own paperwork and accounting. I did take them to court and without a lawyer of my own. Their Attorney couldn't even make heads nor tails of their accounting and dropped the case completely. Seems to me that a company as big as that, could surely afford to have better training for the people who are counting their money!