No you can't sue. If you have not paid, there is no loss to you and you have no basis.
they'll sue YOU eventually. or not. doesn't matter much. in the meantime they MIGHT report the account as delinquent to the bureaus. you can dispute the report if this happens.
start here -> annualcreditreport.com
I never received a contract nor said I agreed to anything.
It'll be easier to dispute the charge with your credit card company, assuming you paid with a credit card.
of course you owe the cancelletion fee bet you never
read the contact you signed now did you,
juidge will ask you that question
Sure you can sue. Any idea what it's going to cost you? A lot.