offering me shares for a company that may have a covid19 vaccine

hung up

Said hello they hang up

They called my name few times.. so i asked who it is.. then they said 'bill set' (it sounded like that). so i said 'who??? bill set??'.. then they just hang up.
Feel so bad afterwards... regretting me repeating after him as my voice could've been captured and use it against voice recognition system.