If you have received a notice of additional assessment from the tax authority from the South African Revenue Service (SARS), and you believe it to be incorrect or unjustified, you can follow these general steps to dispute it:

1. Review the assessment: Carefully go through the assessment letter and check the details to understand why the additional tax was levied. Ensure that you have all relevant documentation and records to support your case.

2. Seek professional advice: If you are uncertain about the assessment or how to proceed, consider consulting with a tax professional or a tax advisor. They can guide you through the process and help you build a strong case for the dispute.

3. Lodge an objection: Most tax authorities allow taxpayers to object to assessments they believe are incorrect. In the case of SARS, you can submit an objection using the appropriate form (e.g., ITA34) and include all relevant information and supporting documents. Make sure to clearly explain the reasons for your objection.

4. Submit within the time frame: There is typically a limited period during which you can lodge an objection after receiving the assessment. Ensure that you meet the deadline, as late objections may not be considered.

5. Wait for response: After submitting your objection, the tax authority will review your case and respond with their decision. This process may take some time, so be patient during this phase.

6. Appeal if necessary: If your objection is not successful and you still believe the assessment is incorrect, you might have the option to appeal the decision. This process may involve further documentation and may even require legal representation.