Wrong Pricing & Bad Attitude of supervisor

I went to Pick 'n Pay Tyger Valley in my lunch time, and bought a minion puzzle that was priced R99,99 on the rack. When I came to the till it rang up as R129,99. Everyone just looked at me, as if I was in the wrong and as if I just have to accept the price. The lady behind the till called a superviser, who took ages to come and then just passed the till. When she returned, she ignored us again and just shook her head and kept on walking. Another supervisor came eventually and changed the price after I went and showed the lady that packs the bags the correct price on the rack. I've always been disappointed by the service at this branch!