Woolworths South Africa review: Incorrect sizing

I am so disaatisfied with your customer service, I recently bought school shoes from Woolworths Sandton City initial sizing was a size four from the tag and the hanger, only for my child to wear the shoes and was uncomfortable in the other shoe, only to find out that the uncomfortable shoe was a size 3 mismarked I have never seen my child so uncomfortable and crying on his first day of school I had to fetch him from school and go exchange the shoe I do not know exactly what your policies are but when I went to Woolworths Jabulani mall found a lady there who wanted to compensate with R100 from Petty Cash box, eventually advised that the R100 in a gift voucher is all they can offer me after all expenses and inconvenience incurred, am a regular Woolworths customer but really after this despite the quality that I love so much will be reconsidering in purchasing anything after this.
I am in disbelief that a store that I favor so much could be so inconsiderate about the difficulties I faced in purchasing what I thought was the right size only to find out it was sized incorrectly.