Long distance charges to be lowered?

I received a call from a man who claimed to be from "the phone company" and was working with Verizon to lower the long distance charges.

Supposedly Verizon is lowering the long distance charges by switching to a different long distance carrier, and each phone subscriber is being contacted by phone by this other company.

I became skeptical when he quoted an amount that seemed unrealistic.

I told him that I would check my bill and he offered to call back later.  And he has not called back yet.

Has anyone heard of this?  The caller ID indicated that the call was from the Miami, Florida area. An internet search indicated the number has shown evidence of being used by telemarketers, etc.

Is there someone I can contact at Verizon to make sure that I haven't authorized any changes to my long distance carrier?

Regards, Eric.