If neither Aeroplan nor a U.S. DOT complaint gets you satisfaction, you might ask a lawyer you know or the Legal Aid Society
https://legalaidnyc.org/get-help/con...-claims-court/
about the feasibility of suing Air Canada, LOT, or maybe both of them for money damages in Queens County Small Claims Court (Air Canada and LOT both do business in Queens County; AC at LGA, and LO at JFK).
Yet another option is to contact Christopher Elliott at
elliott.org
to see if he can help. His organization advocates for travelers who have had travel-related problems. (This might be easier than engaging in litigation.)
Best of luck!