Microventure's K-1 Form

     I have had Microventures '500 Startup fund'  for 6 years, each year, they sent me K-1 form with interest and capital gains they had never distributed to me, I have to pay tax for those money I have never received.  I've asked them to either distribute the interest and capital gain or remove those amount from my K-1, they refused to correct do anything. 

   I feels like they are just shifting tax liability to me.

  Should I discuss this with IRS and ask them to take a look at their business and decide if they should pay tax for the interest and capital gains they have never distributed to me?

   What should I do?

   Thank you.