Bob — product payment

Refund of 775 has been made by amazon on 05th of november 2019 regarding a product the reference number of the refund is ref[protected]. But the refund has not been receive yet. Bank is saying no amount has been receive by the. I've talked to them again and again but no response is coming. So i need to file ' charge dispute'. I need bank to resolvethis issue as soon as possible or in gonna take some legal action.