Synergetic Communication, Inc Say i owe 1,357.67 Houston TX

Synergetic Communication,Inc sent me a letter in the mail yesterday saying I owe 1,357.67 but will settle for 339.42 due 5/24/18. I don't know what their talking about. So, the lady I spoke with today, I asked when did I attend the college that she's referring to, and she said 2007. I told her I wasn't in school then. I went to that school prior. I'm almost finished paying my student loan off and she said that the money they 're trying to collect wasn't a loan. It's for tuition costs that the school paid for me to attend. I feel that this is a scam. Why out of all these years would they try to collect now. I'm not paying Synergetic Communication, Inc anything. Plus I asked to see more information about this so called tuition cost that I owe.