Cake can break brick, supermarket: not expired, consumers store improperly

Two days ago, Mr. Su bought a bag of loose cake at the local supermarket. The next day, when he ate the cake, instead of tasting what he expected, Mr. Su felt a pain in his teeth. The cake, which was supposed to be soft and delicious, now had only one taste: hard. In Mr So's words, it was the hardest cake he had ever eaten in his life!

To get a better idea of how hard the cake was, Mr so picked up a brick from the side of the road and smacked it down, but it barely budged. Not only did the cake not deform, the brick was broken after several more blows!
Mr. Su bought a plain honey cake, 6 for 4.05 yuan. Mr So said he had bought the cake before and it had always tasted normal.
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After finding the bag unusually hard, Mr. Su said, he found that the outside packaging did not have a product name or even a production date, but two labels, except for the supermarket logo, weight and price.

Again came to the supermarket, see a few bags of cakes on the shelf feel not hard, and the cake certificate of quality of the production date is December 25, the shelf life is 30 days. Which means the cake isn't expired. For the two labels, the supermarket manager explained, because of in-store promotions, so re-affixed with a new label, will only lead to two labels, cake is certainly not expired.

The shop owner also said that the cakes Mr. Su bought, like those on the shelves now, were made on the 25th of last month and are still within their expiration date. As to why it might have hardened, the shopkeeper thought the cake might have been exposed to the air for too long. After Mr. Su bought the cake back, they could not judge the storage conditions. Mr So was incredulous that the cake could break a brick after only a day's storage?

According to the number on the cake packaging certificate, the manufacturer of the cake was contacted. For the reason of cake hardening, manufacturers said their products are qualified, cake hardening is the reason for too long naked. Boss?

For Mr. Su's situation, the manufacturers have also proposed an analysis, this cake before sale, may have long been exposed, become the hardness of the present.

If it were you, what would you say?