Greetings from Polygon Support.

You basically sent the tokens to an address controlled by the exchange/wallet.
 
They hold the keys to that account on Matic. Only they can unlock it for you.

You would need to ask them to configure Matic Mainnet on their wallet (https://medium.com/stakingbits/setting-up-metamask-for-polygon-matic-network-838058f6d844) and send it back to an address that you control.

Note there's a disclaimer on the web wallet asking not to send funds directly to an exchange account.

Here is what any exchange needs to do in such a case (although not sure how much flexibility the support executives have to execute this):

- Assuming the exchange support executive has access to the account's private keys, they can transfer the funds from their account on Matic to your (the user's) address on Matic.

Note: Please don't send funds directly to exchanges that support only Ethereum you have to first withdraw from Matic to Ethereum and then send it to your exchange address

Regards,