Caller: Some kind of online trading company rep

Say they got my number from some website I signed up to a year ago. Said they “just want to share information”. I stated multiple times I’m not interested, and requested multiple times to be removed from their call list to which I was told “I cannot do that because that’s not my responsibility”. I informed them they therefore must pass that request on to the relevant department within their organisation to honour my request or they can be legally open to litigation. He said he cannot do that and then proceeded to talk over me. I then hung up on him.