Dis-chem Wonda special

I bought 2 of the Volkano Kids Doodle 8.5'' writing and draw which were on Wonda special and after I received an sms this morning saying the order is being processed the store called me saying they are out of stock and do not know when the stock will come. I however advised that I will wait till the stock arrive and they said I will have to buy at a normal price if I were to wait so their solution is to refund me.