My iTunes disappeared from my iPhone 7

i just purchased the iPhone 7 and 3 days later my iTunes disappeared. I backed up everything on my mac air and when I did a restore it said I had to download iTunes on the apps store However it does not work and its also not the same iTunes that came with the phone. I even wiped my phone clean to factory settings and iTunes is still missing. I have tried doing another restore and it keeps coming back to the same thing...

can can anyone assist ?

Thanks