I had a dispute with Bull Capital Invest (bullcapitalinvest.com) and went to their complaints process. They have an internal team that just defends the company. Then they said I could go to an ombudsman - but the ombudsman they use is industry-funded and rarely rules for the client. The system is rigged.
Pros: Responsive team|Full transparency|Wide product range
Cons: None so far|Limited cryptocurrency options