Plusnet is total disaster. I still have no landline and their broadband, service was down from Wednesday late evening until yesterday midday (Thursday). Their web site and support phone lines were down too.
I found that there are a few websites/blogs dedicated to the "great experience" of their service over past years, like this one for instance http://ihateplusnet.blog.co.uk/

So stay away from Plusnet, and don't waste your money. I served already my notification of cancellation at end of October.