Have you got a broadband fault with BT Infinity in Glan-y-don? If your provider says the line test is OK then the fault could be internal! speak to BT Fix first.
Most broadband faults have a underlining voice fault book a Stressless test. A unique service from The Phone Fixer and available to residents of Glan-y-don. Call 07531522765 or Leave a message on 0151 324 1424 and I will call you back.