Thanks for posting and keeping this thread updated. I cannot apologise enough for the loss of dial tone since Friday. I'm going to try my best to figure out what is happening.
I've managed to locate your account and I can see another area fault has been raised and the reference number for this is F004297300. It appears this was identified by the amount of engineer visits being booked for your area although I don't have access to a figure.
I imagine a few other people had the same message as you to say it had been fixed and therefore called back to say it was ongoing. At this point no area outage was raised so they'd proceed to an engineer visit as per process and this triggered the team to raise another area fault.
It looks like the estimated fix date has been set to 15/03/16. I'm back in tomorrow so I'll happily check it again and pass any updates on to you.