Mar 20, 2015
If the error box you're talking about referred to a virus or problem with your Mac or iPhone, it's a scam. By calling the number you most likely validated your phone number with the scammers, so you will probably get calls from other number for a while. IF you never answer calls from unknown numbers and NEVER call back, the calls will eventually stop.
I can attest to that. It's aggravating, but it will stop. Oh, and your iPhone probably has a built-in blocking option, so look into that. You can block each number after the first time a call comes in from an unknown number where no message is left or if the message appears to be from a scammer.