005000 , vem fan är det ?

http://whocallsme.com/Phone-Number.aspx/005000
This caller is a real 'tryer'. Has called regularly either to try to convince me that they are my computer support firm or simply to unnerve me. To begin with they said they were PC Help - and that I was with them. Finally, after several calls I told them the name of my adviser. The same voice came back pretending to be him. I told them they were a scam. They keep ringing. Last time I told them the name of my support firm. Today they pretended to be this firm saying my 'password needed to be changed my Windows was being corrupted!' I said I would ring back to my support firm when I got to my computer. They tried again immediately. I told them again they were a scam, then I checked immediately with my support firm to make absolutely sure. They confirmed this is a scam. They are surely wasting a lot of money on telephone calls, and are very stupid to believe I am going to fall for this.