Amazon India — Refund 899 of returned item battery bank not received

Ordered an battery bank on 8th May order[protected]
received same day. Defective product was picked on 10th May by Amazon agent. Replacement was committed on 3 calls but never received. After 6 days of followup of replacement product, they finally cancelled the replacement order on 16th May thru the Amazon representative. Based on my escalation to the Amazon grievance cell got a call from agent on 16th May who promised that the amount will be credited to source account within 5 days but that never happened. Based on this commitment she asked me to close my complaint which I did. ( recorded conversation of agent is available with me) . When repeated complaints made subsequently the standard reply is that we are investigating. Now on 10th june after 1 month the agent says that the original product not returned. On 16th they confirmed that product was recd and payment initiated. Recording of this call is available with me.