BT Scam call with disturbing amount of information in their hands

[gfdhome]

Just to let you know that I had a sophisticated scam call this morning on my BT landline claiming my router security was compromised. What was worrying was that they had - 

* At least part of an outdated BT Acct No for the line

* Had the corresponding mobile contact No

* Sent a 4 digit PIN to the mobile No purporting to come from 64364, a BT No from which I have had valid PINs in the past.

Cheers

Ahado

[Penybanc]

Happened to me today. No idea how they can match up my BT landline number with my mobile number (not with BT]

That I found very worrying. A data breach somewhere