They don't offer phone support and depending on why the disabled your account, they probably won't be re-enabling it... or they wouldn't have disabled it in the first place.
I also don't think it will help your cause if you tell them you want to re-enable a disabled account to use the hosting space as backup space.
Also, you're not going to get as quick of replies from them as you normally would, since you stop being a customer once the account is terminated. If it was because the order got marked as fraud, or because of a content violation, you'll likely have to deal with abuse instead of support... and that can take some time.
In any case, if you're leaving, backup your data to CDs or DVDs and take them with you. Or better yet, take the computer with you. If you don't leave it behind to be destroyed, you won't need any backups.
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