Next time, hire a better photographer
Sure, digital imaging made a lot of people sell themselves as "photographers" becasue they can press a shutter button. Cameras in phones even more so. Did you ask them for a portfolio, or at least some examples of their work?
Anyway renting a Sony Sony PXW-FS7 4K Super 35 Professional Camcorder willl cost you $375.00 for seven days... so far less expensive than a iPhone.
Sure, you have to add a lens, if you want a 4K camera with a built lens it's even less expensive ($163 for seven days).