WTF Amazon: using my phone number for automatic 2-factory authentication

Today I was displeased finding out that not only Amazon did took my phone number from my addresses provided only as an easy way to reach me for shipping companies but they did also enable an automatic 2-factor authentication(SMS) at login with that phone number, something that I never enabled or agreed to do.

Here comes another creepy facebook, where your phone was only supposed to be only used in a given context but was proven otherwise.