Related number: 02920822640
Had calls from both of these. Also a Vodaphone pay-as-you-go customer.
Comms Direct is the company.
I suspect that Vodaphone have sold all their pay-as-you-go phone numbers for cold calling.
Given that this is a national number, be advised you'll pay national rates for the call. Given that I don't recommend hanging around on the call for them to remove your number.
Might suggest emailing them on: feedback@cdleurope.com
Or writing to their registered address:
Head Office - Cardiff
Floor 5, Dominions House
Dominions Arcade
Queen Street
Cardiff CF10 2AR
If you're feeling particularly annoyed don't stamp it. They'll have to pay on collection.
Haven't tried this yet myself, but I certainly will if they call again.
For reference website is:
http://www.commsdirect.net