Someone unknown added a phone number and a new mobile pin to my paypal account recently. I called paypal support and they walked me through changing the pin. Fe

Someone unknown added a phone number and a new mobile pin to my paypal account recently. I called paypal support and they walked me through changing the pin. Few minutes later, the pin was changed once again by the unknown person. I call paypal again and they walk me through a similar process again. Finally it stopped but it left me feeling very vulnerable especially because I'd enabled two factory auth and it did little to prevent it. Weird enough no funds from my account disappeared. Not sure if me acting so far(within minutes of compromise) had to do with it.