What is your Line Length, to help put the Down Attenuation in context?
It seems likely that your neighbour's line pair is probably in the same multi-way main cable as your own, in which case cross-talk, particularly from the AC ring tones is likely; and unfortunately is very unlikely to be eliminated, because of the higher mutual capacitance and inductance implicit with lengthy lines.
Additionally, if you can hear any untoward noises on the line, then Ian's advice of reporting it to your PHONE Line provider, as a VOICE Fault, should definitely be followed.
The PHONE Line provider is the company that you pay the Line Rental to.
Edited by eckiedoo (Tue 05-Aug-14 10:36:27)