I would guess this is an AIM valid Screen Name such as an Apple issued @mac.com account.
I would also guess you travel to other countries.
There have been several posts about @mac.com names and people who travel and use their Screen Name elsewhere having the name Suspended.
Can you Log in here https://settings.aim.com/ ?
Is this where you saw the Suspended message ?
For AIM issued name the answer is to change your Password as this tends to prove you own the account.
This does not work for Apple IDs used as AIM Valid Screen Names as AIM can't tell when the password is changed (They can only see it when you log in)
However you need to be very clear that you have an Apple Issued Name and that you know that resetting the password that works for AIM Names and that you would like them to reset the account.
More recently this has been a sticking point. It seems the Contact you get does not always know about the agreement that AIM recognises Apple Issued IDs as Valid Screen Names and that the AIM servers can only view the passwords at specific times (or at least confirm them) so you changing it will make no difference and that they have to step in manually.
Please, if posting Logs, do not post any Log info after the line "Binary Images for iChat"
iMac 2.5Ghz 5i 2011 (Mountain Lion 10.8.2)
G4/1GhzDual MDD (Leopard 10.5.8)
MacBookPro 2Gb (Snow Leopard 10.6.8)
Mac OS X (10.6.8),
Couple of iPhones and an iPad
"Limit the Logs to the Bits above Binary Images." No, Seriously