I have no idea how the company got a hold of my number, but whoever works their landline phoned me, and the conversation followed:
Me: Can I help you?
Them: ... *click*
Thinking, okay it's just a wrong number but they phone me again seconds later. This time the conversation went this way:
Them: .... *click*.
What a rude bunch. At least apologise for having the wrong number and the inconvenience caused.