As usual when these things happen, I would look at your email account security first. I've a strong suspicion that these "hacks" are actually happening when people compromise your email account (either through phishing, use of a common password or use of a password used on a haveibeenpwned account), meaning it's the easiest thing in the world to reset PINs or change email address details so you don't get any more notifications etc.
Last edited by Retron; May 1, 2019 at 9:36 pm