Ridiculous service

Got very bad service from Avis airport drop off's. When I mentioned that the service am getting is ridiculous I was told by JP or PJ can't remember, that we will not be assisted cause we abusing staff. How is raising my dissatisfaction at the level of service am getting abuse, I would understand if I had said the staff was ridiculous. Are we not supposed to complain when your staff refuse to assist us. All I simply wanted was to sign for something as the Durban king Shaka branch had called me to ask me to sign something when I get to OR Tambo branch. They wanted me to tell them exactly what I must sign, when I ask them to call the Durban airport branch as the didn't tell me in detail they kept on refusing and still continue to ask me what do I want to sign. What away to end my vacation experience. Eventual they give us something to sign when they had insisted that we don't need to sign anything we can just go. We were also charged R59 for a device that we were told is free by Amanda from Durban, that's very ********* to sell a product under falls pretence of it being free.