ETH address but no linked wallet

Hey people Some weeks ago, I made a transaction on an upcoming token. Using eth blockchain.

There was the opportunity to buy directly without a linked wallet (chooses that cause of lack of trust in the recommended wallet, but got that later). Made a direct transaction. Now I cannot reach out for these tokens. The payment service is like “there is a eth wallet address, so there must be this address at some of your wallets” But like I say, didn’t use a wallet How to connect this specific eth wallet address? Where are the coins now? ????