You will have to call Blizzard Account services and see what you need to do in order to access your account again. Typically accounts are frozen cause either you or someone who hacked your account did something against the rules.
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Yes, you use your Battle.net account to log into World of Warcraft.
No, you can not buy my world of warcraft account, i have put too much time and money into it.
Poo in your cornflakes =)
If you wish to quit playing World of Warcraft, simply enter your battle.net account and stop the subscription payments. Your account will close once the timer expires. This does not delete your account, but you won't be able to play. To delete the account entirely, you can find the option in your account, or by contacting customer support.
$14.99 per month