Terrible quality screen for IPhone 6(Stellenbosch)

I took my 1 month old iPhone 6 in for a screen replacement to the Stellenbosch WeFix. Got it back same day, the screen quality was questionable but I let it slide. The thing started malfunctioning and showing strange lines 2 weeks later. I went back to the store, they changed the screen again and they put on a worser screen, the thing looks like it's made out of plastic even on maximum brightness. I feel cheated and this phone doesn't feel like an iPhone anymore. They didn't even replace the screen protector I put on the first screen that got replaced.