Hi, i bought some NTF polkamons, i got charged for the NTF’s but nothing is on there web page.
What should i do?
Welcome to the MetaMask Community @AdamFM !! 
When you search for the txid of the transaction on etherscan.io, does the transaction of the NFT from the sender to your account/address show as successfully completed? If so, you can add your NFT to your wallet, but I suggest doing so on your MetaMask mobile app as the web browser extension does not currently support displaying NFTs.
You can find steps on how to add your NFT to the mobile app here.