With great difficulty.
About a couple of years ago, when I had a toll based (NSW Technical colleges) student account, that was costing A2c (about US1.3c) per minute, I thought I'd go for one of those free 100 hours for one month, AOL accounts, when they started out in Australia. However during the startup procedure of clicking ok, half a dozen times, it asked me for my credit card number. I was a bit hesitent, but I thought 'fuckit' I'll be cancelling in 4 weeks anyway.
Well it didn't quite work like that. Within 3 days I had a cybersex thing going with some English girl who IMed me, so I let it go for 2 months, before disconnecting. The funny thing is that AOL don't like it when you try to disconnect, they kept asking me why, & asking me whats wrong.
Well that was that, I figured I'm disconnected, but the next month I get a AOL deduction on my credit card slip again. So I rang up & it appears they hadn't disconnected me. So I demand to be disconnected & they'd say they do it with in the hour. Then they offer me a free month as compensation, so I said ok, think I'll have another chance to talk dirty with the English girl . Well 2 days bwfore the month is up I ring up to disconnect & go through all the 'Don't you like us' questions. But guess what happens for the next 2 months they kebt billing my credit card. But this time I was one up on them - I rang my bank & told them never ever to pay AOL as they keep false billing me.
So remember, it easy getting AOL, but its bloody hard to get rid of them, once you've had enough.