Worst customer service experience !

I was **** to and a promised a free screen repair. I was always under the impression I get 1 free screen repair with Samsung s6 edge. Ifix in buitensingel Street promised me other wise. I was reassured and promised on 4 -5 occasions I WOULD get my phone fixed under warrenty and not have to pay. I was even promised by the Samsung advisor who was in store. I was told 5-7days for parts to arrive and 3-4hours to repair device. I phoned to follow up. I popped in check if my device was ready to which I was told tomorrow 13.04.16. This is my time, airtime and petrol wasted. I phoned today again to see if my device was ready only to be told it's now going to cost R3500. Everyone is now denying these facts making me out to be a **** and saying that the Samsung advisor had never agreed to this and never heard of it until today. The regional manager offered me 15% discount. I'm not being ungrateful but this is seriously one of the worst cases of customer service I have EVER experienced and having worked in retail myself for 7 years. If I had made a mistake of this magnitude I would be held personally responsible as should ifix be held responsible to fix my device free of charge as PROMISED!