Why Did Google Remove My Review?
As of 2022, Google has cracked down on fake reviews big time. This includes friend circles, business owner circles, paying for reviews from people out of the country, and incentivized reviews. Unfortunately, the system is so complex that occasionally a real review will get removed by accident, and right now there is no way to fix that. There is no one to contact or call.
If the review is removed, try having the customer or client rewrite the review from a different account. It could also be because the review text matches too closely with a review they left somewhere else like on Facebook or on Yelp. If every review is exactly like it is on the other review sites, you have to vary the text otherwise Google will only give credit to the first review that shows up and the other ones might get removed.