If you removed the LP token instead of zapping out to redeem your matic/maticx, you will need to click the add liquidity button on that vault. This will bring you to the DEX where you can look for the remove liquidity option. Once you have found the option, you will need to select the LP token you want to remove and enter the amount of LP tokens you want to remove. After you have done that, you will need to confirm the transaction and wait for it to be processed. Once the transaction has been processed, you will be able to redeem your matic/maticx.