You're not meant to be charged if the fault is not your responsibility (e.g. it is not before the master socket); what you are describing is a fault prior to the master socket with the line itself, the third engineer did not see it that way. Was anything replaced in your property? Is the noise gone?
Nothing has been replaced, and yes the noise is still there even if our internal system is disconnected. The problem with the noise is variable and intermitant ranging from a perfect line, not not being able to hear the dial tone, or the tone dialing being able to be sent over the noise. Usually after bad winds or wet weather. Same problem for the 7 years we have lived here.
FYI our internal system was put in by a BT engineer as a PJ when we remodeled the house. He has done a PJ test for us and it still checks out fine.
If they cut service then they're in breach of contract, assuming the charge is incorrect, as you have paid all sums due.
I have paid all call and rental charges to date but not the £95 engineers fee. I refused to pay this and had them note it on my account together with the rest of the history.
Service was cut for about 4 hours. Phone and internet.
Don't phone. You'll have no record. Write again by recorded delivery requesting compensation for the number of days you had no service, and for your line rental to be adjusted so you don't pay for a service you did not have.
I think this applies to all the major telephony companies.
BBC - Watchdog: BT customers paying their bills and more