Amazon India — Wrong product delivered and then picked up haven't received refund yet..

Since 2016 I'm customer of Amazon with subscription of prime membership.. haven't faced any issues until i ordered hush puppies brand formal shoes and one sneakers of the same brand costed 4203/- At the time of delivery i open the package in front of the delivery boy and i received both the shoes and sneakers are of different brand name something centrino that's the brand of Amazon i guess idk..At that time in front of delivery boy I've called customer care and told them all the incidents and i share them images and then they placed for the return pickup after 2 days..after 2 days delivery boy come and picked up my order..i was waiting for my refund and checking the refund status it's showing item is picked up when we recieve we'll intiate your refund..until 10 days message showing still same.Then i called customer care then he say we raise a complaint for you our team team will investigate and inform within 3 days..And next day they email me that your return number is very high and you have sended me wrong items..i don't understand without proper investigation they are just blaming me..i already sended him picture that time I recieved the product how can I change the product..and till now I've orderd more 250 product from Amazon's and probably I had not returns more than 20 products and i only return which were not useful or some size issue..i don't know why they are behaving like this but I'm not going to use my account anymore..after pickup they didn't inform me or nor delivery boy refuse while at time of pickup while checking the items..when i complaint for my refund then they blaming me that you have sended wrong items.. I've all the images and call recording when i complaint about the at the time delivered..