In this case I think if your casino or gambling platform is legit and if they are licensed then it has basis if there are no irregularities then you can contract with them. Generally, if the amount is small, it does not create any obstacle, but when it is large, it creates various obstacles. Before making a complaint you must check carefully whether you have any missed matches with various conditions. After informing them if everything is fine they will definitely let you know if there is a problem and the next step will depend on that.
Many people get nervous and when a casino blocks the account to conduct an investigation. They accuse the casino of being scammers. For me, if this happens, the first step is to talk to the casino, as you point out, f you have done nothing wrong and have nothing to hide, things will work out, especially if we are talking about a trusted casino like the many we see on the forum.