Was your number originally a ‘BT’ number or another company’s number ported in , did you join BT from another company at the same time as getting DV or were you a BT customer getting your regular phone service successfully, and we’re moved onto DV with no say in the matter ?,
Are these landline calls from other operators customers ( like Sky and Talk Talk for example ) , do you know anyone with BT ( either regular or DV ) can they get through ?
Its obviously upto BT to investigate this as your provider , but it’s possible the problem is with the way other companies are routing their outgoing traffic , it’s worthwhile getting a list of companies that are failing to connect their customer to you to help localise where the issue may be …if you have issues with other BT customers though, that obviously is BT’s issue to sort out.
