Terrible Service

We gave our two months notice in advance 31.05.2019 to our rental agent and she confirmed that she would advertise our place as we told her that we would like to keep the deposit. She then went on sick leave. I than corresponded with another lady at the same office and she told us that we can advertise the place and that potential client could contact them so that's what we did. My husband phoned the portfolio manage to confirm that we found someone and that we would like to keep our deposit (second time) she said she would get back to him. It never happened. We then gave the agents number to the potential client. She phoned the agent and suddenly the agent know nothing about it. She would than get back to the client which she never did and now we have lost the potential tenant. This is very very bad service. We as tenants are very angry with the poor service received and would never ever rent from them again. They have done nothing from there side to assist us here.