This is in reference to our offer letter dated [date], duly accepted by you, and your subsequent letter dated [date] for an extension of the joining date.
As per your request, we have extended your joining date to [date], which is already [number] days late from the original date of joining. However, we regret to note that despite accommodating your request to extend the joining date on two occasions, you have neither turned up nor shown any interest in joining us. It is important to emphasize that the extension of the joining date goes against the company's policies, but in your case, we made an exception.
It appears that you may not have an interest in joining our organization. Nevertheless, as a goodwill gesture, you have been given an additional 72 hours to join. Failure to do so will result in the automatic withdrawal of your employment offer without further correspondence on this matter.
Regards,
[Company Name]