Somehow my phone number was removed from my account and now i cannot add it again. When asking support why it was removed they've responded multiple times with

Somehow my phone number was removed from my account and now i cannot add it again. When asking support why it was removed they've responded multiple times with the same canned email saying they can't remove the phone number requirement. I repeated said I don't want it removed, just to know why my number was removed and how to add it back, but yet i receive the same canned message.