just had one.
landline call, picked up phone, "This is OFCOM, your internet connection will be cancelled in 30 minutes unless you speak to BT, press 1 to speak to BT ..."
I didn't press "1".
I looked on the net.
Its a scam. High call charges if you do press "1". Possibly they would try to scam you further.
Ugh! My phone is on TPS system too, who knows where they got my number.
Beware!