Fraud collections

I received the same letter that the others did, except I work for a church and our secretary isn't authorized to make a purchase of $774.95 (original price was $649.95, two years ago).  I was also suspicious when they told me the agreement was made in Jan. 2010 and the invoice sent didn't need to be paid until the 18 month contract expired... and that this was the first I was hearing about it.

I requested to hear the recording they said they had, and I listened.  However, it could have been easily doctored so it holds no weight.  

I called the guy back and told him I was filing complaints with the Attorney General's office, the FTC Bureau of Consumer Complaints, and the BBB.