Mouldy C***** Cheese Slices

I bought a pack of c***** cheddar flavored full cream processed cheese thick slices 24 (400g) from Shoprite Southdale on the 22nd December 2024. We opened it and ate some slices. This evening when we wanted to eat again we found that they are mouldy. The expired date is Aug 2025. Barcode is ***. What happens now with this and I paid a cool R56