Bata India — bata formal shoes [protected] taylor sli uncomfortable and causing pain in legs

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Hi,

I bought formal shoes article number [protected] taylor sli for orion mall, panvel bata shop. This shoes has soft rubber type inner sole which is very soft.
I bought it on 2 oct 2019, but due to rain in mumbai i did not use it until last week. When i used it whole day, it caused huge pain in my both legs. I did not use it on next day and tried on 3rd day, but it again caused huge pain and i could not sleep for almost whole night.
I contacted bata orion mall store, they said they can't help and i need to contact customer care.
So i contacted customer care, they said i should have brought this issue in 3-4 days after purchase, but since it was raining i could not use it. They are not agreeing that there is some issue in shoes design.
They send me same copy-paste the pain i am suffering from is due to extra softness of the material inside shoes.
When i explained my situation in reply.
I do not think bata cares about customer. I have paid inr 3499 for this shoes and now customer care says concern is beyond consideration.
Whom should i approach now to get refund or another good pair of shoes.