Scam, don't call back

Phone rang. Unknown number so I don’t answer. Msg left on voicemail was a recorded msg Asian male voice saying my call was important and to hold for next available person. Then an Asian woman’s voice said hello then silence then hung up.

The caller asked for my son by name. I asked who they were and the purpose of the call. Caller advised they were calling from an 'multi-national' investment company, who are looking for investors to diversify their incomes. I advised the caller they had called someone who was under 18 years of age! Caller advised they would remove number from their list.

Caller: Something capital

Came through as a local number and knew my full name really weird

Called the number back, very bad line, sounds like a foreign call centre. They hung up.