1. First, you need to verify whether the rating agency has given you an accurate rating. You can know the rating standards and rating agencies by consulting the website of the property tax management department or relevant institutions to confirm whether your rating is correct.
2. If there are misunderstandings or mistakes in rating, you can prepare relevant materials and contact rating agencies or property tax management departments to apply for re-rating or correct rating errors.
3. If the rating is accurate, you need to pay the unpaid property tax as soon as possible. You can contact the local tax authorities to understand the specific procedures and requirements for paying property tax.
4. After paying the property tax, you can apply for re-rating and improve your credit rating. Please note that it may take some time and pragmatic tax records to improve the credit rating.
Please remember, according to different regions and related policies, the specific handling methods may be different. Therefore, I suggest that you contact the local property tax management department or tax department for professional guidance and help. They will be able to provide you with more accurate and specific information.