The fastest way to ensure you get what you want is to return the item you have, and once the return is accepted, make a separate purchase for the new item.
Fastzọ kachasị ọsọ iji hụ na ị nwetara ihe ịchọrọ bụ iweghachi ihe ị nwere, ma ozugbo a nabatara nloghachi ahụ, zụọ iche maka ihe ọhụrụ ahụ.