SX200 ICP. Installer and Maint1 passwords with R/W. Passwords changed, not default. No Write with other passwords. Hacker keeps changing Externsion (Destination) for operator in vmail form 50. I've changed operator password and both levels in Admin mailbox. Here's the kicker; the system was hacked last time with router powered down so I'm suspecting they are dialing in through auto attendant. Auto Att is now off. Any ideas?

technician password

As above

Been years......never used it before....THANKS!