The only reason you would be charged is if it is any of your own equipment i.e. your phone/sky box/extensions causing the noise. If it is a fault with either the E or D side as McHaMmEr said then it will not be a charge as that is a problem in the external network.
If you find out you have been charged and the fault was in the external network then they have charged you in error
Ah ok then thanks. So theres a good chance i wont get charged then you reckon as bt heard noise on my line during the call (and logged it) while my phone was plugged directly into the test socket? By the way i've tried two wired phones as well just to make sure and each one i've heard noise off while plugged in at the test socket.



Whatever it was though, someones definitely changed something as my internet isn't cutting out anymore and no more crackling noise especially when the router was connected (although it was happening at the test socket as well). All good so far, at least untill i see our next bt bill!