Amazon India — product ordered at amazon got cancelled automatically

Address:	490020
Website:	Amazon.in

I ordered redmi mobile 6a on amazon the amount was paid through net banking and product was to dekivered on 14.10.2018 as no information was sent to me, i tracked the consignment and was taken a back to read (Undeliverable) product reached bhilai and was sent back to seller.
I took up the matter with customer care spoke to various persons including some seniors like mr shivam etc they have no solution except to apologize, money has not been credited to my account also. They asked me to buy again but the product is not available.
I have seen these kind of issues are now rampant with amazon kindly probe the matter further and ensure the model i ordered is delivered to me urgently. Amazon has conveniently viped out the orders from my account which again is unethical.