Amazon — refundable

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Website:	Amazon

I have reached you so many times for return powermax fitness mft-410 4 in 1 multi function manual treadmill. I have returned this product under return period. But seller has denied to return this product because as per him this only under replacement policy. As per amazon trademill is under 10 days return only policy, i have attached snapshot of that. When i bought this product the product was under 10 days returnable policy, now seller has changed to 10 days replacement only.
I have seen many seller doing that and am attaching snapshot of 1 products which has changed his policy under 15 days. I am buying products from because of amazon trust but this time it's giving me nightmares. I really want to return this product, product is unused and packed.
Your customer care executive are giving me different answers every time one your customer executive said that this product is 100 % under returnable and refund will be issued to you for sure, now they have started denying too. If product is not under returnable policy then why there were return window on amazon. This is last time i am contacting you because i am definitely complaint in consumer forum for this. Product is not chip so i can let it go. Please solve my issue and create return for this.