receiver
So even if they registered their address on ethereum network, they still can recover tokens from polygon address?
Who is the receiver and define who is they.
If you are transacting/sending to other people you know about or a person, there is a way to resolve the issue with the deed of another party.
And If you are sending it to an exchange or any platform, do also inform us who/what you are dealing with. After you give that information, it would make all of us clearer to help you and find if there is a plausible next move you should do.
Im sending funds to exchange, third party site
What is the name of the exchange?
Anyway, you can also see their term of services in regard to wrongfully sending a transaction across networks. See if there is a clause that they are able/want to recover it, usually, there might be some percentage or the minimum amount they will charge in order to recover it. Technically,
sending recovering the wrong token/cryptocurrencies from Matic chain into ETH chain is possible. But since it a third-party platform, all of your funds stake is all on them.
EDIT:
So as i understood now, they ( third party exchange site) need to follow the instructions as Witcher_sense sent, and then they will be able to recover those tokens, right?
No. You have to confirm the exchange will accept your request in their TOS. If they would, they will handle the recovery by themselves.