Amazon - Wrong and trash shoe received and now Amazon is not refunding the amount

So I ordered Nike Infinity react shoe on **th Feb , cost ****, on **th Feb, I received a trash and third graded quality shoe, I called the customer care immediately and explained the whole situation, that the shoe is not the right one, and asked for a replacement, to which they agreed, a few days later the delivery guy came with a new shoe, when he was investigating the first shoe, he saw that the image is not matching and refused to take it back, meanwhile i checked the new shoe as well, it again was of pathetic quality , so this time I asked for a refund. For many days, Amazon didnt picked up the shoe, even after calling them multiple times, finally on *th March they picked it up, they asked me to contact on **th, I was skeptical and contacted early and came to know that my refund has been cancelled, because they have received wrong item, It is the same trash shoe which i got on day *. Please help