What do I do if I received a 1099-MISC for money I never received?

I received a 1099-MISC in late 2017 last year for money I supposedly received in 2016. My father passed away in 2015 and the company that he worked for sent me a 1099-MISC for just over $6000 in 2016. I'm not exactly sure what to make of this as #1 I never received any money from his company and #2 I received it well after tax season was over. I honestly forgot about it until this new tax season. I am obviously going to call the company that sent it to me as soon as possible, but am wondering what would cause something like this to happen? Has this ever happened before? What am I supposed to do about this? Is it taxable? When I look up my transcript on the IRS website it is there even though I didn't file it.