Honestly tak boleh guna lah sis, kalau puting dah cacat macam tu ada risk dia leaks atau baby tak dapat suction yang proper, tak worth the hassle with feeding! Since you beli from official Shopee store, boleh try contact Avent customer service or return it, biasanya mereka bagus with defects like this. The number on your packaging (FAB 09/10/2021) tu likely batch/manufacturing date, so at least you punya proof if you want to claim. Sabar je, these things happen and they usually replace without fuss!