IPhone back camera not working?

So I dropped my phone the other day facing down and now the back camera seems to not me working. The flash and all that doesn't work I've tried basically everything but restoring it yet. I too it to the "phone doctor" and they said they tried replacing it twice and it didn't work so they're ordering a new one in. Please if you know anything about this issue on iPhone 7 id love your help.

Tap the lightning bolt in the upper left of the screen and make sure the flash is On. Try to restart your iPhone (press and hold the Home and Power/Sleep buttons). Turn on the Flashlight from the Control Center. If it works well, your camera flash is also ok.

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