If gambling has been mentioned with Starling, then it’s like banging your head against a brick wall. Ultimately I got nowhere with the ones where I mentioned gambling, I put in complaints because of how evasive and unhelpful they’ve been, and received a tiny amount of compensation because the investigator agreed it was handled badly, but still refused to file chargebacks .
Only success I had with Starling was where I went goods not received, no mention of gambling, and could provide invoices.