I have the same issue, I had left my apartment, paid up to date and PSEG supposedly had sent this outstanding amount to the address contiunualy after I left. It showed up as a collection for the first time since its origination (2002) in May this year - I freaked and paid the CA without negotiating removal of any negative info. (to hastey now after reading these forums !!)
I have had to work backwards now and send GW letters to PSEG & the CA (NCO financial). I also DV'd with all 3 CA's. Currently Equifax are in their investigation mode, Experian intially stated that they could not do anything after reviewing my info but now they have sent a second letter stating that the Collection is deleted. But I have heard that it can be reinstated at any time.
After writing to PSEG customer center, I am now going to write to all the PSEG exec board (based out of Newark, NJ)
Kepp on keeping on and keep me up to date with what happens to you and I will do the same.
Good Luck
RJW