Inferior leather and terrible after sales service!

Purchased our Boston full leather lounge suite in 2015. Less than 18 months later it started peeling outside of the seating area. We were also told to pay the R350 call out fee and we refused...however we noticed now that it is peeling even worse. Behind the head rests and on the sides...you can clearly see that a different type of leather was used behind the headrest and the sides. We paid the R450 call out fee. The technician came out and said we have been using Mr Min on our R40k lounge suite!!!! We didn't have proof of their leather cleaner and they cant find any purchases so they are refusing to honor their warranty. My argument is why is it only peeling outside of the sitting area and if we were using Mr Min as they claim(as if we would be so stupid to do that to such an expensive lounge suite), then my entire lounge suite should be peeling all over. They have now sent us a letter from their lawyer stating that they are not obliged to accommodate our claim! This is outright ****************.