woolworths Southgate sell expired stuff

I went to Woolworths SOUTHGATE bought cocopine coldrinks on special 2 for R30 ON THE 11/04/2019 ONLY TO FIND THAT THEY HAD A BB 11/04/2019. I ONLY REALISED ON THE 13/04/2019 after experiencing terrible heartburn after drinking it, contacted customer service spoke to Lebo and she told me there is nothing they can do for me , the store had a right to sell the product and it was my duty to drink the whole 2lt bottle on the 11/04/2019...that is wrong....so wrong , I am very disappointed in Woolworths Southgate .. ref: ********** ********** 880