

What little I know about chargebacks comes from the banking side of things, and usually we see that each claim is investigated separately. Visa and Mastercard however might have some internal process for issues like this, wouldn’t be surprised tbh.
Thing is, I don’t think they would want to go against this particular merchant…
Afaik for normal purchases you have 120 days within which to initiate a chargeback. But there’s exceptions to that, for example if what you paid for was something like say a subscription, then the 120 days can extend to the timeframe within which you were supposed to be receiving what you’d paid for.