The actual product delivered seems to be well made. Instructions are clear. However, the product description on Amazon makes incorrect claims regarding its size. It's clearly not for Group 1 babies. If your baby is about 8 kilos, you'll find it to be right fit. There is no way an 18 kg baby can fit in here.
You can't even return this item. So, you will have to take the long route of writing/ calling amazon. Then describe and go through hassles.