Get the reason in writing and the clause it relies on. Screenshot your balance, the withdrawal request and every support message with dates. If you funded by card, ask your bank about a chargeback for a service not delivered. And complain to the licensing body — for Spinfin Casino that means an offshore licence that public sources report inconsistently (Tobique Gaming Commission or Costa Rica), not UKGC, which carries far weaker protection than the UKGC. A common sticking point is mandatory verification (KYC) before any withdrawal, withdrawal limits of roughly €4,000 per transaction (about €8,000 weekly and €16,000 monthly), and demanding wagering.