Poor Service - You are losing clients

I went to CrossTrainer on Saturday 5/3/2016 evening at 20:16pm and bought a pair of size (9) (Jordan) sneakers valued at R2499.00. I briefly wore the shoes for about half an hour and realised they were awfully uncomfortable and would not fit me even after they would stretch out of the \new\" state as their sneakers usually would. I then took them off and packed them in their packaging, preparing to visit the store the next morning for a size exchange.The next morning of 6/3/2016 at around 10:00am I phoned the store and asked to be reserved a size (10) as I would be in their store in the next hour to exchange my existing pair for a slightly bigger one.I was advised that the size (10) had been sold out and I could only be assisted with a size (11) which I agreed to look at even though to me this was way too large to even consider and to my surprise when I got to the store and had the opportunity to fit them on, I realised the size(11) was my perfect fit, which I find to be a serious production discrepancy on their side as nobody advised I should be weary of size cuts being smaller or bigger when I asked for my size. Sadly I was refused a size exchange due as I was told I wore them."