Do not pay any more fees and taxes as this is part of the scam to steal more of your money. Only the government in the country where you live can request for you to pay taxes on investments. I recommend you start to take screen shots of everything for your records (emails, chat apps, profile pics, trading account, website, etc.) You can file a complaint with the FCA online and below are links.
The Financial Conduct Authority is the conduct regulator for around 50,000 financial services firms and financial markets in the UK and the prudential supervisor for 48,000 firms
www.fca.org.uk
The Financial Ombudsman Service is a free, fair and easy-to-use service that settles complaints between consumers and businesses that provide financial services.
www.financial-ombudsman.org.uk