T-Mobile Password keeps being changed

I received two emails, one giving a verification code for changing the password, the other showing that the pass word had been changed. I printed the emails and took them to the T-Mobile store. They could find no fraudulent activity but advised me to call the number on the emails. The agent on the phone could not find the activity except that I had been to the phone store. He asked me if I had been there and I said "I'm there now." He first told me it appeared I had not signed up yet but I explained that I had been using T-Mobile Home Internet for over two years. Then he said that he seen that. The explanation I finally received was that the emails were fakes and that I should delete them. Although, the phone number on the emails did belong to T-Mobile. But when I tried to log into the community, my password no longer worked and I had to set a new one. So my password had indeed been changed.