W60B Compromised and unable to factory reset

[socialtelecoms]

We have a user with a W60B and 3 W52H.

Over Christmas the network and phone were compromised, the admin password changed and a forward was applied to a premium rate number.

We have tried to factory reset the unit multiple ways using the connection button and powering the base on. also by using the reset base station function from the phone handset.

Result: all handsets are unpaired but the Base Station retains the account settings and admin password so we still can't log in.

I can't log into the web interface to get any information from there and the users are not technology savvy.

Are there any suggestions on anything else that can be done?