Imagine if there really was a completely safe and reliable investment which paid as little as 10% per year, each and every year. The fact is that investors would flock to it. Financial news networks around the world would talk about it. There would be very little need for such a company to advertise. There would be absolutely zero need for such a company to call people up asking them to invest.
Here's a simple rule: If some company calls you out of the blue about a profitable investment, it's a scam.
Hey, maybe I'm wrong. Maybe there's a 0.01% chance it's real. Are you willing to bet your money on 1 in 10,000 odds?