Afni review: I think this is a scam!

I have received a paper in the mail from Afni Inc stating that I have a balance due totaling $214.70. It states that the original collector is Contel of the South Inc and this is their attempt to collect a past debt. They are offering that if I pay half they will consider my account settled. It says that the disconnected phone number the balance is attached to is [protected]. I don't have that number nor do I ever recall having that number in the past. I have never even heard of Contel of the South Inc. I am afraid that this is a scam. I tried to call the number they gave me on the letter and the options the automated person gave me are check your balance, pay your balance, and speak to a representative. I tried to speak to a rep however I waited on the line in silence for over ten minutes without anyone responding. I have looked a little bit online to find a lot of other people with the same exact problem. I have found that this is affecting people's credit and I sincerely hope that you can help before it affects to many more!