Bogus collection notice from ERC

I am looking for advice on an odd collection notice that came to our business. It says it is from ERC and that the original creditor is AT&T. The amount is relatively small, $129.36, but I am not into aiding and abetting thievery.   It is addressed to a person who does not exist, however it is a mash up of my name.  My maiden name is the given name and my middle name appears as the family name.  I can't tell if they have a social security number.  I most certainly don't have an overdue amount with AT&T.  Our business has been in the same location and had an AT&T account since 1989.  I think if we had an unpaid bill we would have received a notice from AT&T directly. I always pay my bills, have all my life.  Consequently I have an excellent credit rating and I don't want that messed with.   I first thought ERC might just be a scam outfit, but I did a search on them and they seem to be legitimate, although they are labeled as aggressive.  I am hesitant to call them since this notice seems so bogus. What would be best for me to do at this point?