Irritated by Pampers Premium

I bought a box of Pampers Premium at Game in Southgate. It was the first time I was buying size 4. I have never had problems with Pampers premium size 1-3 but it was a different story when I started using size 4. The nappy leaks and it sometimes burst. The quality of these nappies that I bought is not that of the Pampers premium I have been using all along. I need a refund or exchange on these nappies and you (Game) can take it up with your supplier.