What is a viaticle?

How do you find out the status of a viaticle that I purchased around 15 years ago?

I have mine which was purchased 15 yrs ago, and the company that is holding it, AMG, Inc. has a number to call and talk to the person that has those files. I had 4 viaticles and 2 have died... 15 yrs later !! The saleman said that it was a good investment as good as "sliced bread". He is no longer in business and his license is gone. But I still have to pay the premium on the 2 remaining files. Worst investment I ever made! Stay away from them ! People are living longer with new drugs !