Claimed they were from Penelec and needed info from me to process my rebate.  I knew what the con was but played along to hang them.  They asked me to get a current bill and give them my 20-digit customer number.  I told them "you're really another energy supplier and are trying to slam me, aren't you?"  They agreed but tried to sell me on all of the money they could save me.  I told them never to call me again.  Then I called Penelec to give them their phone number.

called to change electric supplier