Don't believe hack related gold missing.
What did the CS Team say about the missing Gold?
Compromised (by an outside 3rd party) accounts are eligible for an Account Restoration. If it is proven your account was compromised by such an entity, then you can request said Account Restoration. But only the CS Team can provide that information. If the Gold was removed for another reason, then it is not likely it will be returned.
Good luck.
Sounds like ANET took the gold from ya as your friend was probably a hacked or compromised gold selling account.
The pvp community reminds me of what Obi-kittenenobi describes Mos Eisley as from star wars.
they have been taking gold from people who have been suspected of buying gold for real money.
That which has no life.