NBN interference

[VK2VRC]

I have had FTTC for about 12 months or so ,without any problems, then last month, during the big rain event we had, suddenly I have S9 noise on 40m and 80m and S8 noise on 20M , but when I transmit on 20M I get a noise signal that appears to attach itself to my transmit frequency . I would understand if it appeared when they installed the NBN,but this is nearly a year later.

   

This happens as soon as I key up and the noise is very loud.
What should I tell NBN Co when I call them,I am sure they will be very helpful if I say that I have interference on my Amateur radio equipment ?

Regards

Wayne 
VK2VRC