Often , when a ‘fault’ or ‘delay’ is posted on here , a lot of pertinent information is withheld, wether it’s an oversight or deliberate, so is there any background to this situation, like , have you received any communication about another company or person wanting to take over your line , have you recently been contacted by BT about being moved DV , is there any reason at all why there could be changes to your BT service, like have you been in contact with other providers about potentially taking your service to them , even if you never committed to joining them ?.
Its much more likely if your telephony should be working as it always did ( so still a PSTN line not DV ) that it’s a fault rather than the consequence of BT arbitrarily raising a cease order for your telephony, apart from anything that wouldn’t leave your broadband working , for your service to end up like it is , it would take a series of order ‘errors’ , not just one error , for you to have your BT broadband still working but by design, not having any telephony .
Are you sure it’s not a simply a fault on the PSTN phone side of the ‘line’ ?
