Galaxy S5 Screen gone after three weeks

I had to return my Galaxy 3 for repairs 3 times within the guarantee period and a fourth time one month after the guarantee period. I considered the Sony as replacement but was eventually convinced by a technician at a Vodashop to buy a S5. After three weeks the screen was gone. The repair shop in Bloemfontein demands R160 as a backup fee and will then send it in for a period of 10 days during which they will borrow me a primitive phone that cannot even read e-mails. They refuse to replace the phone. How they are getting past the Consumer Protection Act, I don't know. My advice is never buy a Samsung again.