Parcel never delivered

I ordered a book from Amazon (order 112-4193143-3704239) on 28 November 2025. The delivery was late, but I put that down to a lot of delivery due to sales in November. Later, I tried to write to Amazon but got no reply. I went into their website and nowhere is there an option that you can indicate that you have never received your parcel. It says it was shipped, but it was never delivered. I was never provided with a tracking number. There is no customer service email to report this. According to Amazon if you did not get your parcel, you are refunded. I have never been refunded. It is so frustrating. I really wanted that book and I paid for it.