1095-B

My husband went on Medicare part B in 2013.  He's always been covered under my employer sponsored plan.  Now, 12 years later, they are making him take Part A and they are charging me 100% penalty because he "should have gone on Part A in 2013".  In order to remove the penalty, I have to provide proof of his coverage all these years, going back to 2013.  My question is, if the 1095-B didn't go into effect until 2015, shouldn't 2013 & 2014 be grandfathered?  My employer back then has gone out of business and these insurance companies have that automated system, that no matter how hard I tried, I can't get through to a person, because I am not a current member.  What can I do?