1. Have you signed an agreement or contract with the other party? If you have signed an agreement or contract, you should specify the ownership of the intellectual property. If you determine that the intellectual property belongs to you, you have the right to determine how to use and how long to use the design. If you are required to pay a design fee, the ownership belongs to the other party, then you have no right to control the use of the design. If there is no regulation, the default ownership belongs to you.
2. If no agreement is signed, you need to keep the email you sent to the other party or the receipt that the other party received the design draft. If you keep the email or receipt, it means that the design draft was provided by you, but the other party did not pay the design fee for the design draft, or even if the fee was paid, the ownership of the design draft should belong to you. You have the right to ask them not to use the design draft.
3. If there is no evidence to prove that the design draft was provided by you, and you didn't conduct copyright registration, there is nothing you can do.
4. If there is no evidence to prove that the design draft was provided by you, but you have registered the copyright, you can ask the other party to stop using the design on the grounds of copyright infringement through negotiation or prosecution.