I had both LVNV and PR CA's on my Credit reports and PFD both of them.
While PR was easier and faster- LVNV did agree to PFD and followed through on their promise.
My LVNV CO was 2.5 Years old and about $200+ (PFD at $200)
My PR CO was close to 3 Years old and about $500 (PFD at $225)
Both reported as CO's at time of PFD request.
I used the addresses on my Credit File to write them. I emailed PR and send certified letters to LVNV.
Just Google their address and send a certified letter for proof if needed down the road. They are a shady bunch and just about lead the complaint dept at the BBB for CA's for suing past 7 yrs of old debts.