Competition Complaint

Good day. I bought the 850gr Parmalat Cheddar Cheese at Checker Ridgeview Wilro Park Gauteng on the 28.11.25 and entered the competition. On Sunday the 21.12.2025 I bought my second 850gr Parmalet Cheddar Cheese at the same shop and when entering it says I am not successful as I have already enter and the slip is invalided. I have phone the store with no help and I have phoned the customer care line number on the label and they will pass my query on to the right department. As the competition end the 31st December 2025 I would like to enter my slip or hear from someone as to why this is happening. If this does not happen before closing date you will have a very upset client and I will take the matter further as I have all info on my cell.