Online and in store price difference

I was looking at gifts for a birthday came across a Nerf gun pack for R299.00 went into store to get it. Drove to 5 different stores to find one final found the last one in store and the price there was R449.00. They gave the manager a call and he said it's online only but it does not state that it's an online exclusive price. They then insisted I pay the R449.00 Will never buy there again