Similar situation here but as a UK resident. Paid for a
Premier Class ticket MEX - HAV - MEX. This e-ticket is endorsed with:
REF/CHG/CXL FREE OF CHARGE/NONEND
Not flying until 9 May but all AM flights to HAV have been cancelled until 31 April and I expect this will be done for May soon. Have emailed AM and they flat out refuse to refund me. I escalated as their website still states Premier Class tickets are refundable, which is not the case.
I paid with a debit card, so cannot do a charge back and booked with AM direct. Looks like I'll have to claim through travel insurance as AM don't seem to be budging on this, which I think it entirely immoral given they are still selling these tickets as refundable.