First, the company is not in this city, and it specializes in recruiting people in Guangzhou. Because the recruiter comes out to recruit, the recruitment team will find a suitable place for a unified interview, and you are not the only one. You will be notified to report to the company after passing the interview.
Second, the company is in this city, but there are recruitment activities in Nanguo Jiayuan, so it is reasonable to go there for an interview.
Third, the company's business is in Nanguo Jiayuan, where there are outlets or offices. At this time, I won't inform you to report to the human resources department. I will go directly to the business department for an interview with the business director. After the formalities are passed, I will go to the human resources department and work directly in the business outlets of Nanguo Jiayuan. (This is most likely)
Finally, I suggest calling again to communicate in detail and asking why the company headquarters is not allowed to go for an interview. Wish you success!