Allergy reaction from Sasko Low GI Whole Wheat Brown bread 800g

I usually buy sasko low gi whole wheat brown bread 800g and my family loves it. But this time my 4 year old son ate of the bread and he badly reacted to it with big patches of hives allergy reaction. After following through with the company, I am dissatisfied with the company response to the matter. And the denial of the effect the bread has caused my son, is leaving a bad reputation to me and my family. And this is making me question the credibility of your products as the whole.