AOL service

A few months ago I purchased a Dell laptop computer while staying and taking care of my father in law. Only thing I could get in their location was dial up AOL. So by purchasing a dell the customer was entitled to 6 mo free aol dial up service. Well after 2 mo I noticed I started getting charged 25 dollars for the service. I wrote and then called and finally they told me my paper work wasn't filled out right. Yeah right. So last month I contacted my credit card company and told them that I have written several times to AOL and stop charging my card. Before I would let them charge my card I would stop aol as its WAY to slow anyway. The card company gave me credit for 3 charges from aol because I disputed charges. The only way to completely stop is to change card numbers and that’s a hassle. Guess what, got my card statement yesterday and yes I have another charge. Any ideas how I get them to stop or what would you do? Can't seem to get in touch with anyone at aol that knows anything. What a rip off they are. Thanks in advance for any ideas. I for sure will probably have to change card numbers it sure doesn't seem right to have to go through that. Nels