Medicare is a Federal program so Massachusetts and your advice don't sound quite right, I would call your Medicare (in Massachusetts) numbers and get the straight scoop, get things straightened out:

http://www.massresources.org/medicare.html

If you cancelled SSDI then that could be a problem but the Medicare Parts A and B insurances are taken out of one's Social Security payments automatically or can be added on, etc. bought along with C and D, etc. Massachusetts doesn't really have anything to do with it.