In Semantic Mastery's weekly Hump Day Hangouts episode 330, one viewer asked about the best way to merge two GMBs quickly.
The exact question was:
I have a client that needs a merge of GMB accounts. I have been trying to get this done by Google for the last 4 months with no luck. I keep filling out the GMB form they provide and I dont get any response. This is a legit business that moved and we do not have access to the previous listing as another company did it. IS there any other method to try to get this done that you know of??