I joined a reputed company in India, and worked there for 7 days. They did not provide me any offer/appointment/joining letter until that time. I haven't signed any document stating the notice period policy.
I absconded from the company after sending them a decent email from my personal mail, without serving the notice period. They replied to my mail with the due amount of notice period salary. They do not have a probation period.
I don't expect any wages or documents from that company since I have no need to put in on my employment record.
I believe the company should not take any legal action, and their mail is just an empty threat, since I haven't signed any letter with the notice period clause.
What can I do to minimize my risk in this situation?