To me, it wasn't so much the billing...did not have a problem with it, however, when I requested copies of the letters they were "supposedly" sending to the three credit bureaus? It was on plain paper, no letterhead and looked like I was sending it with no signature! Paying $80/moth for that? I immediately quit, did it on my own and was successful getting a few items removed.
They do not send anything out like it's from a Law Firm. Total scam. Take some time and write the letters yourself. Had the letters been on a law firms letterhead, it may have gotten the attention faster.
Write the letter...send it every two weeks and it will get reacted to.