Contract termination ?

We’re in GA trying to sale our house. As I get to know our agents, we notice they use multiple phone numbers to call and text us, and never inform us house showing schedule when we requested they simply said “ we have no time for this Day before the home inspection my husband drove to GA home he arrived late night and he saw multiple room lights was on and several doors were unlocked. The day of the home inspection buyer showed up at least 10 cars and full of the family and friends were in the house and after 4 plus hours of the inspection my husband noticed the wood floor was ripped out and backed gate looks like someone forcefully lifted up and it’s misshaping will not close. We quickly notified to agent they offered to fix it and they are requesting another home inspection again, but we told them not to without owners present and authorized. However buyer and inspector came to our house asked for door lock code we have changed. We refuse to give up the code tell them to leave but agent were pressure us to tell lockbox code. Unfortunately we have to call police request for property inspection and now our house is on watch by police officer and neighbors. After the incident agent send us transaction information for us to provide Persona who will be taking care of transportation name “ Areal kiss” We refuse to give up any information and I want to terminate the contract. Also this third party is using low cost GA agent and they told the agent don’t deal with us directly it’s the third party’s deal. Please tell me what is the best way to deal with them because they have no physical address or real phone number and we can’t find them social media either