In case you'd had sleepless nights worrying about how my mum is doing without her only connection to the outside world (her landline phone), you'll be relieved to know that her phone was back on around midday yesterday. So you can call off the boys with the big sticks and knuckle-dusters.
It took me three long calls and an email of complaint (and possibly another call from the sister in law) to achieve this. While they were at it, they also put the phone account in mum's name.
If they'd only done this latter task when I first asked them to (at the beginning of this month), it would have saved us all a lot of stress, frustration, wasted time on hold and in hopeless conversation and me getting unwanted instructions from family (but not the boy because he was just lovely and supportive) on how to "fix" the problem.
But at last the problem is fixed (though I still have to check they aren't going to try and bill her for two phone accounts or anything stupid like that).