I am writing to apologize for the unwanted trouble I caused you. I understand that my actions were inappropriate and caused you distress.
I want to take this opportunity to express my sincere regret and remorse for my actions. I recognize that I acted inappropriately and understand that I should have taken a different course of action.
I understand that my actions have caused you pain and inconvenience and I apologize for that. I am sorry for the disruption I caused. I am sorry for any harm I may have caused you and your family.
I am deeply sorry for my behavior and I want to make it up to you. I will do whatever I can to make it right. I am willing to take whatever steps are necessary to make sure that this does not happen again.
I understand that I cannot undo the past but I want to assure you that I am committed to making sure that this does not happen again. I will do whatever I can to make sure that I do not cause any more trouble.
Once again, I apologize for the trouble I have caused you and I will do whatever I can to make it up to you.