Bad ice-cream

Sunday past I bought the pick n pay 'swirlz' ice-cream. I just wanted a ice-cream on hand just in case. So it's been in my freezer. This afternoon Tuesday my little asked if he could have some ice-cream I smiled and said yes of course knowing I had stocked up. But when I opened it I was shocked to see the condition of the ice - cream. It seemed to have shrunken, and the texture seemed weird it was sticky almost dough like. How can I feed my family this junk. I called the stored but they first want to see my slip. Im not even sure if I can find my slip. I've never bought a bad ice-cream before.