I was contacted by DVSL on 02084958734 and asked to confirm my name and address, as they had a letter for me.
I asked how they got my number, they got a bit flustered at this and dropped the name HFC which is a company I used to have dealings with many years ago.
I asked them to remove all my data from their systems and to provide me with their complaints procedure, HFC would have my address.
Did a bit more digging and they're associated with CapQuest.
If you're rang by this number don't answer, if you do ask them to remove your number from their systems and put the phone down.