It actually depends on why. If bạn were suspended unfairly, like is people reported bạn for nothing, hoặc bạn logged onto a server with past abuse, if bạn write to the F4, they should be able to help you.
I've actually been deleted before because I logged onto a public computer with past abuse on it, and I wrote to the F4 and explained the situation, and they reinstated my account.
Here's a link to the F4 member who helped me and got me mine back:
link If bạn haven't done anything wrong, bạn should have nothing to worry about, :)