Wockhardt.com — Medical retailer is not accepting the (mycoral 360) medicine return before 4 months of its expiry date as per company standards.

I have purchased Mycoral 360 tablets. As when doctor asked to stop the usage, i trued returning it to the medical store i bought it from. But the store owner says that we dont accept immuno suppressor retunr before 4 months of it’s expiry. The medicine is pretty expensive and there is still time for the medicine to get expired. Kindly help as per your best knowledge about returning a product before expiry. Is there any rule something like that? Is the information true does the company refuse to take back its product before expiry?