Cease all contact with these and any other foreign firms that make unsolicited calls or send unsolicited letters and emails to seek your business. They are all frauds. Send no money. Report the fraud in the States to the FBI at IC3.gov and to the Federal Trade Commission at FTC.gov. Report them to your police and to your FCA so that they wlll put out an investor alert to warn your countrymen.
Your FCA warns about boiler room scams here.