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Plugging the new modem in will not automatically switch you to NBN and the the new modem will not work on ADSL unless your correct Bigpond username (full Bigpondpond email address) and password have been entered in the modem. Did any off the support staff advise you to check this?
To check this open a WEB browser on a device connected to modem and go to http://192.168.0.1, login I’d and password is admin / Telstra. Go to Broadband and check that username and password are correct in the PPPOE settings.