Are these scam emails?

[okgaz]

Recently I've been getting emails via my vbulletin contact form by people saying I have charged them for a service they haven't used. Here's an example:

call me *phone number*
I have called repeatedly and it always appears that you are too busy. I did not authorize this charge.

Has anybody else been getting these / is it a scam?

I don't charge anybody for anything !

--------------- Added [DATE]1248449821[/DATE] at [TIME]1248449821[/TIME] ---------------

Edit: I finally replied to one of them. It does indeed look like it's a scam. He told me he had spoken to somebody at my office and resolved the problem. It's funny as there is no office.

Watch out for these scammers guys. They have business websites that look legit and US phone numbers!