Brand Rep review: Will not return owner ship to my google account

In Oct 2019 I hired Brand Rep to do reputation management for my Google account they told that in order for them to work for me I would have to make Brand Rep the owner of my account I would have to be the the manager. I am a senior citizen I did not know that was not true so when I had to cancel they will not return owner ship and they are doing things to sabotage my Google account would you please help me.
Thanks