Hi,
Yes it is a ridiculous situation.
My first thought isn't about right and wrong - rather practicalities. If somebody in your family can do without their phone for a few days then it might be a good idea to programme it with your number and leave it at your mother in law's house. I appreciate you shouldn't have to, but more important is that (especially if she is vulnerable) she is able to get help if she needs it.
Now on to the problem itself. I've seen a few of these and in general, tiscali and talk talk tend not to be at fault - the real culprits are BT as they own and manage the exchange and maintain who is connected to who. If they don't do their bit properly, all tiscali and talk talk can do is to keep asking them to do it and hoping that they do. On that basis, please don't reward BT by switching to them.
I know from experience how frustrating this can all be. I can also assure you that there is no easy way out and that any further changes in who you do business with will only complicate matters further and make it take even longer to resolve.
The best action you can take is this. Write to the chief executives of Tiscali, and Talk Talk, copying in Ofcom, explain as briefly and pertinently what has happened and ask them to arrange it amongst themselves as a matter of urgency and to reply to both you and Ofcom detailing what action they will take and by when. If you send this via email, then it makes it easier for all of these companies to reply to all without having delays of weeks whilst letters circulate.
Tiscali: Mary Turner, mary.turner@uk.tiscali.com
Talk Talk: Charles Dunstone, dunstonec AT cpw.com:
Ofcom: 020 7981 3040 (Sorry - you'll need to phone them to get an email address to send copy correspondence to, and yes it most certainly is a complaint, primarily about the landline phone)