Westpack Lifestyle NEW MARKET ALBERTON

I bought a personalised balloon at Westpack New Market on 14 November. a few hours later the balloon deflated. I the called the store and spoke to Treslie who told me that the balloons only lasted 8 hours. So i told her that I always buy the exact same balloons at another store and days later the balloon is still perfect. on 16 November I sent the pictures of the perfect balloon bought at another westpack store as well as the pictures of the balloon bought at westpack new market. I then got a call from Brightness who told me the error was in fact on their side hyet the refuse to compensate me for the money that I lost due to their error. How many error has this store made at their customer's expense.