I have joined a new company as a Sr. HR Executive. Before joining, they told me that on the day of joining, I would receive an offer letter, and after the completion of probation, they would provide me with an appointment letter. Now, I have come to know that there is nothing like an appointment letter, but they simply issue a confirmation letter. The company is ISO certified. They have informed me that they will provide me with all company benefits such as PF, Bonus, and 21 Paid Leaves after I am confirmed. I would like to know if this is okay or if there is any risk. Is my job insecure?