Amazon - Returned Wrong Product but dint get the Refund

I had ordered a Samsung Note ** Ultra on Sep - ** and I did receive the product on ** - sep The item which I received was Apple iPhone ** Pro so I called the customer care and raised a complaint and said them to take the wrong product back and to refund my amount but they said they don’t have an option for refund they system is updating as replacement do not worry This time you will get the right product and even the replacement I got the same wrong product the iPhone ** Pro so I raised a complaint again stating again I received wrong product and Thai time I asked them I just want the refund and the agent stated yes ok fine we will initiate the return and once they receive the product they will initiate the refund but now they have blocked my account and state that this account and an unusual transaction so we have put a hold on your account and we cannot refund you the amount so sorry.