My TPG Digital Voice number  (re: TPG NBN Service) is suddenly not working.  It has a dial tone but cannot make outgoing call and cannot receive incoming call.  I use this phone number in my home office so it is very important for my business.  I checked NBN outages in my area and did not find any outages so why is my landline not working?  I need this phone service desperately, would appreciate if you could help resolve the issue ASAP. ... View more