I don't understand????

1) I place an ordered for this item (Antec Prizm 120 ARGB 5+C 120mm Case Fan w/Fan Controller (5 in 1 Pack) on Amazon yesterday

2) This is a same day delivery item so I should receive it on Wednesday yesterday

3) I did not receive the package at all

4) I called Amazon today, and explained to them that I did not receive this item yesterday

5) Amazon customer representative apologized to me for this delay, and offered me a full refund to this item. He told me this item will deliver to me on Friday and that I will not have to return it back?????? But on Amazon app it says " Please return this item once it has been delivered to you."

6) ???????? Amazon is giving me a free item worth $75?! Should I return it back or no??