I've run some checks on your broadband connection, the line and the hub have come back as fine which is good. However high peak time traffic in your area is causing the slow speeds you have been experiencing. Our networks team are investigating the problem and are improving bandwidth and performance to help with this issue. The reference number is F004261508 and has a review date of 8th February.
I know this is frustrating and I'm sorry for the inconvenience caused. To discuss this further I have sent you a PM (purple envelope icon, right corner).