cybersecurity scammers

I received a call yesterday, September 16th, around 3:50 pm, where they told me it was a cybersecurity call from a phone brand related to the line I have. They started asking me questions about the line being on two different devices and that it shouldn't be that way. Then they told me not to hang up because in a few minutes they would disconnect and remove the other devices. That's when I realized that the man, who gave his full name, told me the call was being recorded and that I shouldn't call telecommunications because they were direct. That's when I realized they were going to steal my line and everything I manage.