Contact your local telecommunications ombudsman about this.

This number has called me twice and both times the caller has abused me when I questioned who they were and what they wanted. The first one told me I was an ungrateful sh*t and I didn't deserve his help and the second one told me I was a sad depressed loser Karen for asking their company name and details to make a formal complaint. Each time I try to call back the number comes up as disconnected yet it's always the same number when it's dialled to connect to me. If you know who these people are please update this post because I'm willing to take my complaint further if I can get some details on who to complain to or how to shut them down. The website he gave me was I think matterquote.com which is of course a now missing website