I suspect he's a child who is not willing to lose money but want to get money from gambling
just look at next month he must come again here to bring other problems
Just ignore such nuisance complaints. There really are gamblers that like that, will create a story upon losing that much. They shouldn't gamble in the first place and just know their place. If someone gets to complain again without any viable reason and it's obvious that they're making up a story, they're just showing what they are. Someone who probably lost and didn't control themselves, they're everywhere and it's not only happening in stake.