ICloud potential hack

moments ago i received a phone call from someone claiming to be ICloud support that our account may have been hacked and that there were attempts from Texas and CA. I didn't believe it at first and i didn't provide any information. the person told me i could verify who he was by logging into Apple. I never got that far. While changing phones we were disconnected and no one call back. I have been trying to find out who at Apple i could call to make sure everything is secure. I am not a sophisticated user and my spouse is ill so i need confirmation that our Cloud information is secure. I have since reset out password.

Thank you