What do you advise me? A company with whom I passed an interview were waiting for me to receive a tax number from my country and I updated them but?

Anonymous
I updated them (by email) that I got the tax number and it's been 15 days without a reply. Are they waiting until a news semester to reply? Why wouldn't they just reply? I don't understand.
SHOULD I APPLY AGAIN on their website for the job and just go through the interview stage, informing the interviewer that I already passed in the past?
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What do you advise me? A company with whom I passed an interview were waiting for me to receive a tax number from my country and I updated them but?
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