They call you up and tell you that you have an outstanding invoice for web services.

guy named jeff called requesting an outstanding invoice for search engine services rendered. Knew my name(probably through company search). Beware as this is a scam! When asked if this was connected with google they hesitantly said yes. Then when I told him we pay google directly, he hung up the phone.

called me up after my yahoo account was hacked and told me I had to pay a online advertising renewal fee. Told him I pay them directly and he got mad.