I would call your credit card company and dispute the original charge.
I bought tickets for a flight that was supposed to happen in April, but didn't happen. The airline played hardball but Capital One (CC) refunded the cost when I called them and explained even though the airline did offer a credit (which I didn't want). They were actually really good to deal with about it.
In this case you bought tickets to a game that didn't happen so should be fairly straight forward
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