they called and got smart

I received a call on my cell phone and when I called the number the lady said they were a collection agency, but my number was not listed so I am trying to figure out who is calling.

got a call this morning from these people and they told me they were a law office... they wanted to collect 500$ from me for student loans... I thought what the heck?.. So I called my student account and spoke to a company representative she said they don't call lawyers to handle accounts. Be wise guys they out to make quick money don't be the one to fall for it

One ring and left no message.   I don't know what they want from me.