Poor Service, ******** and no business ethics

We have had endless issues with Sothebys Umhlanga. In a short space of 9 months we have had 3 different tenants. We have had on going issues with non payment of rental, tenants now squatting, damaging our property & not paying the water bill. I have emails requesting that they blacklist & follow up with procedures, non of our emails returned with answers. They have a Agent in contact with my tenants advising the current tenants on how to avoid paying rent. The Property Manager who takes care of our property has spoken poorly of us from the start to every tenant & has **** about repairs completed & the exit & entry reports. Our previous tenants who moved out on the & 31/10/14 left the property in a poor condition, the exit report did not correspond with the photos given to me, when i queried it I received nothing but lies & attitude. We requested that the deposit not been returned till the damages were repaired, it was returned to the tenant. We were left to pay for the damages. Sotheby's are not taking any responsibility & I had to end my managing agreement with them last week Thursday. We live in the UK. I flew out on the 15/01/15 to try sort out the issues all was in vain.