Someone repeatedly leaves silent voicemail messages. Messagebank identifies number (02) 5639 2798 as the call back number. You can't call it back, it's bogus. If you get calls from this number, ignore them, and block them if you can

told me I had a virus in my internet connection with telstra. I don't have internet through testra. Man had an Indian accent

Keeps calling, when answered, get disconnected. Annoying!

I called back (02) 5639 2798 from a landline and it said the number was disconnected, after receiving 15 calls in 1 day

I called back number (02) 5639 2798 rang once then gets disconnected automatically.