Samsung S4 damaged screen repairs

I took my phone to Woodmead customer care center on Tuesday, 14/04/2015. I called on Wednesday, 15/04/2015 to check if the phone is ready and they said no. I called again on Thursday, 16/04/2015 around 9h00 and i talked to Kay, she said that she will come back to me and she didn't. When i called again they said that i can come in to collect the phone is ready. When i get there the phone was not ready. The manager explained to me that the phone is not charging and that it had liquid damage which i didn't know of. I was only aware that the screen is cracked. She said that i have to pay R1200 for liquid damage because i was only left with 1 free repair. I told her that i don't have the money they can just fix the screen. I had to wait for about an hour for them to fix the screen. When the manager comes back, she tells me that she made me a discount, i have to pay R1000.00 and i argued to say that but i told her that i don't have the money, the only thing i said they should fix was the screen and she said if that is the case i wont have my phone. Then i left without my phone. This is so unprofessional, unreliable and annoying yet they talk about courtesy, quick and smart.