i hate when people always give fradulent advice...
if he subscribed, and gave mythic permission, (wich he admits he did) then he cannot have the creditcard/bank reverse the charges because that is fraud... he agreed to pay it in the first place.
if he just "thought" he canceled the account, and didnt.. thats not mythics fault, or the credit card company's fault.. its his fault.. and he is responsible for the charges.. disputing them is fraud and could get him thrown in jail..
many years back i worked for AOL's billing department, dealt with alot of people that got advice like people are trying to give in here.. and got charged with fraud when they disputed valid charges
is you signup for a service, and agree to pay.. you are responsible wether you use that service or not... its on you.
so before commiting fraud by disputing them... try to work with the vendor....
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-=no pity for the majority=-