Allow this letter to convey my sincerest apologies for the unpleasant incident involving me that took place last week. The incident was truly unintended and happened only because I was not able to concentrate on my work at the time. I had just received news that my mother was rushed to the hospital due to a heart attack and I unintentionally entered your office and used your phone to call her. I was not in the right mind at the time.
Please accept my apologies. I have been working in the company for ten years now and I have a maintained a good record. This is the first time that I have committed a violation to company regulations and I assure you that it will not happen again. I will submit myself to due process for the violation.