1, we should communicate with the medical equipment agents, explaining that we need formal purchase invoices and explaining the importance of influencing the Drug Administration. If the agent still refuses to issue invoices, we can ask it to provide relevant tax certificates or other supporting documents to prove that it has paid the appropriate taxes.
2, if the above measures can not solve the problem, we can consider seeking legal ways, you can contact the local tax department or quality supervision department for complaints and reports, and ask them to investigate and deal with the medical device agents. At the same time, we can also consult a professional lawyer to obtain more detailed legal advice and recommendations.