Area Code 798

Got a call from this strange number . I looked it up and it looks like its the collectors called University of Oklahoma. No idea why they're bugging me. Can anyone tell me if its them?

Robocall saying they were apple support and that my iCloud account had been breached. Asked to be called back at 208-262-0000. Received 6 of these calls from 346 area code in Texas in a 1.5 hour period.

Missed call from this Sprint number from Benson AZ, called back with my number blocked: You have reached a non-working number. Also, used an internet dialer that said incorrect #. White pages has information blocked ans says the number has been searched