Pink lines down screen..

Wel my phone was replaced by my insurance company around about the 23/06/2016 an just 6 months of having the awesome S6 edge it started giving pink lines down the screen, when I sent it in for repairs, waited 4-5 weeks to receive the phone back, so the phone worked good for the next 4 months then the problem started once again, so I complained and I was asked to submit the phone again for repairs, waited a nother 4-5 weeks, okay great so I got the phone back and just 2 months after I got it back, the phone starts doing the same again.. So naturally I started mauling the people who supp**** me with the product.. Where by I stated that when picking up the phone for repairs they should without a doubt drop off a new phone as it has to go in for the same repairs for the 3rd time you can see there is a problem with this product.. So we mailed every one from MTN the supplier to the phone manufacturer Samsung and the response we got back from them was that the screen is under warranty for a 12 months and the device self is under warranty for 24 months were by the phone must go back for repairs and that the product that obviously has a manufacturing problem can not be replaced.. How does this work.. I mean if I know if my product has a problem and it comes back for the second time, I will rather bite the bullet and replace that customers product as I would like his business in the future.. But yeah looks like Samsung is losing more and more clients on a daily basis due to product de-satisfaction.