If you are still a 1&1 IONOS customer after transferring your domain to another provider, it may be due to the following:
Transferring a domain to another provider or between different 1&1 IONOS contracts is not the same thing as cancelling the contract containing the domain.
Your 1&1 IONOS contract is therefore still in effect after you transfer your domain to a new domain provider, and in certain cases, you will still be billed.
If you do not want to continue using your contract after transferring your domain from 1&1 IONOS to another provider, you must cancel the entire contract. The contract will be cancelled at the end of the current contract term, which is displayed for each contract.