How to upgrade a «Potansiyel Vergi Kimlik Numarası» / «Non-citizen's potential tax number» to a real one?

I went to a Tax Office branch and they registered me.
Which Tax Office branch should serve me in Turkey?

I provided to them:

  1. My residence permit document
  2. «Yerleşım yerı ve dığer adres belgesı» («Proof of residence and other address»)
  3. «Potansiyel Vergi Kimlik Numarası» / «Non-citizen's potential tax number» document