Guys, I've received a call from 03-41414141 saying that they gonna install Unifi at my house. The problem is can I trust them with my details etc?

I've done some googling and the number is actually from credit management company.

http://whocallsme.com/Phone-Number.aspx/0341414141

They told me that my house is serviceable for Unifi, but when I check manually on http://www.unifi.my, it says that my house is not serviceable yet.