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Hi,
The LCD screen is faulty and needs to be replaced.
Here’s a link to a [https://www.youtube.com/watch?v=MMz4rOPnJoQ|video] that shows the dis-assembly of the phone so that access to the screen is possible.
Here’s a link to some [https://www.ebay.com/b/LCD-Screens-for-ZTE-Axon-7/43304/bn_106267471|suppliers] of the part. It is only shown to give an idea of the cost of the part. There may be other suppliers that suit you better. Just search for ''ZTE Axon 7 LCD screen part'' to get results.
If doing the repair yourself is too daunting, contact a reputable, professional mobile phone repair service and ask for a quote to repair the phone. You will already know the cost of the part.
Also if you haven’t done so, backup the phone to the cloud or a PC, using the phone’s backup feature, while you still can, before the screen gets any worse. At least this way you will have saved all your personal data etc in case anything goes wrong (hopefully not) with the repair.