First of all, you need to carefully read the content of the infringement notice to confirm the infringement and who the infringing party is. If the infringement is indeed caused by the use of unauthorized Hanyi fonts in your trademark, then you need to take steps to resolve the issue as soon as possible.

Secondly, you can contact the design company, express your confusion and dissatisfaction to them, and ask them to bear corresponding responsibilities and compensation. If the design company refuses to take responsibility, you may consider seeking help from a legal agency for legal relief. If it is proven that the design company is indeed at fault, you have the right to ask them to bear corresponding responsibilities and compensation.

Also, if you do use an unauthorized font, you should stop using it as soon as possible to avoid further infringement. At the same time, you may also consider contacting Hanyi Fonts to discuss how to solve this problem, such as paying the corresponding licensing fees.

In short, when facing infringement issues, you need to take them seriously and take active and effective measures to solve the problem. If you need legal help, seek help from a professional attorney.