Horrific Service!!!!

I ordered a 12-pack of food for my dogs, but only received 1 can. My mother in law ordered the same and received her full 12 for her dogs. So it is not a listing issue. It is a picking issue. I contacted Amazon who then placed an order for replacement. I ordered on the 24th of November. Now, after following up, they say that we are only going to get our replacement by 12 January 2026 once "the investigation" has been completed. This is unacceptable. The internal investigations have absolutely nothing to do with the customers. This was not the first issue I experienced with Amazon. They sent me a used product on a previous order too.