Personally after all these months I would have thought you had discovered that Origin are incompetent at the best of times such as failing to follow OFCOM rules when another ISP initiates a line move. I think the best thing you can do is ditch them and move to an ISP whose reputation isn't less than zero and instead select an ISP that will provide a sustainable service and offer decent value and support. Such ISPs exist however Origin isn't in that number.
What he said, I listened to their lies and rubbish for months, always somebody elses fault, including mine yet when I left all the issues vanished. The guy that i thought was genuine and trying to help turned out to be the biggest liar - Origin were the worst ISP I have ever been with by a country mile.
lots of good ones on here for similar money, definitly I would do as above poster says.