Terrible After Sale Service

I have a cellphone contract with cell c, opened at Eastgate branch. My phone wouldn't switch on, took it to them for repairs on 29/01/2015. Got messages on 16 February to say my device is ready for collection. When I got there I was told that there was water damage therefore it will not be fixed. I know for sure it never got in touch with water, but Andriana showed me brown stains saying its coffee or tea, she basically called me a ****. The very same stains were not documented when i brought in the device like they do with scratches. Im no technician so maybe i would have accepted that humidity caused the damage. but to say device is ready for collection without saying its not fixed is unacceptable. I would never recommend Cell C Eastgate to anyone because of after sale service, it is terrible. She called someone to have the phone fixed, i am doubting the quality of work that will be done on my device.