Hello. My name is ***** ***** I will be assisting you today.What is the link to the review in question?
This maybe difficult, Google won't provide you with the IP address used. There is no way of finding out who actually posted this, anyone can create a fake account and use a free hotspot.How long ago did you flag the comment?
I flagged it as well, however Google gets countless flags each day so this process could take awhile or they maybe simply disagreed with the request.
If you want to pursue it further, you can request it be removed for legal reasons here. https://support.google.com/legal/answer/3110420?rd=2
Other than that last option, I do not know of any other way.
I will escalate this to customer service and they will be able to take care of this for you.