To obtain proof of the new Professional Tax slabs in Andhra Pradesh, you can refer to the official government website of the Andhra Pradesh State Tax Department. They usually publish notifications or circulars regarding any changes in tax slabs. Additionally, you can visit the nearest tax office in Hyderabad to request official documentation. It's crucial to keep these documents for your records and compliance purposes. If you encounter any difficulties, consider seeking assistance from a tax consultant or legal advisor to ensure you have the necessary proof for the new tax slabs.