Had loads of calls from various very similar numbers (last few digits different) so assume it's some call centre

Countless calls over the last two weeks from this number and other similar numbers (last two digits change).
Claims I entered my details in some website because I'm interested in share trading. I did no such thing.
Asked to be removed from their list and they said they can't do that (others simply ignored me) and continued their sales pitch.
One of these numbers called at midnight.
If you get a call from any number like this, please report them to the donotcall website

I called back number (02) 7202 2370 was put on hold music but no one answered the call.