Every vendor / seller have their own policies.
It’s important to check vendor/seller policies before you place an order to avoid any problems with your order.
By not reading the vendor policy tab before you place an order makes you fully responsible for your order as you had the chance to make that decision based on what the vendor has put as his/ her policies. In this case we will not interfere between you and the seller if you did not read the seller’s policies tab. It will be up to the vendor to decide the final solution to your issue.
If you wish to exchange an item please first check the vendors policy tab, usually what is in that policy tab is the final answer to your question in terms of exchange, returns, refunds etc, you may also message the vendor using the information form on their store.