I am really sorry to hear that your Father has been left without service. I'll be able to help get him back online. Please could you send me in the details using the "Contact The Mods" link found in my profile.
does your father qualify here http://www.bt.com/includingyou/redesign2012/assets/downloads/FreePriorityFaultRepair.pdf
did you contact the mod following the contact us link or by PM if PM that would explain why you have not been contacted by a mod contact us link is here
After completing the email NOT PM then you join a queue of other customers waiting for mod help. The mods will get back to you in 3/5 working days either by phone or email
I'm sorry the fault is still ongoing, I can see from the notes that the CEO's office are managing your complaint and regrettably it is taking longer than we would like to get resolved. I can see that they are due to get back in touch with you on Tuesday with further updates.