Ignoring the specifics of this issue and the specifics that you're in a dispute with Coinbase: Escalate this out of their CS queues. The most straightforward w

Ignoring the specifics of this issue and the specifics that you're in a dispute with Coinbase: Escalate this out of their CS queues. The most straightforward way is to involve their legal department, either by sending a letter that will be routed into it or having a lawyer send them a nastygram [0], which will cost somewhere between $100 and $300. [0] Lawyers would typically call it a "demand letter", which would simply observe that they're your counsel, that the financial institution has your money and has refused to return it when asked, and that the financial institution should pay you your money immediately.