OnePlus India — OnePlus online store not exchanging product

I recently bought a OnePlus c-type charger cable in the OnePlus online store. Unfortunately I wrongly ordered Type-C to Type-C instead of Type-A and I reached out to customer support for an exchange. They said they can't exchange and I can reach out to OnePlus experience offline stores for the same. When I reached out to Tnagar OnePlus experience store, they said they can't do and customer support is just deviating. However, it's not mentioned anywhere in the OnePlus online store that the product are not returnable and this is day light robbery. I've been using OnePlus phone for 8 years and this is Pathetic