ABSOLUTELY DISGUSTED AT SAMSUNG SERVICE CENTRE TRYING TO RIP ME OFF R4000

I AM ABSOLUTELY DISGUSTED AT SAMSUNG SERVICE CENTRE TRYING TO RIP ME OFF R4000 WHEN MY PHONE IS STILL IN WARRANTY. My Samsung S6 EDGE recently started showing a Pink Line down the middle of the screen and call audio only working on speaker. After doing some research I discovered that this is a common issue with the Edge models. Took the phone to Service Centre at Dion in Woodmead, they could see the phone was in perfect condition & working 100% despite the Pink line Issue. They took my phone in advising that they would need to replace the LCD, which will be done under the warranty. I week later they call me and advise that they have the new LCD but they CANNOT replace it since they opened the phone and found some liquid inside. They now insisting the warranty is void and I must to pay R4000 to replace the SYSTEM BOARD! If I agree to pay the R4000 for a new System Board they will gladly replace the LCD for free within warranty. WHAT **** IS THAT!! I refused, and they put my phone back together and returned it to me...A month gone by now, my phone is still working perfectly 100% fine, except for the Pink line. I AM TOTALLY DISGUSTED AT SAMSUNG SERVICE , trying to RIP ME OFF the Warranty especially since this is a known fault on their phones, WHY should I pay R4000 for a new system board when the original is working perfectly...it’s only the screen that needs to be replaced. THIS IS ABSOLUTELY UNACCEPTABLE – It’s like my insurance company asking me to replace my car’s engine and then they will gladly replace my windscreen! ABSOLUTE ****! Definitely some FUNNY BUSINESS GOING ON! I will never be purchasing another Samsung product again!