Here is a sample template you can use to write an apology letter which ensures that the mistakes will not be repeated.
Subject: Apology for Inconvenient Services
We are writing this letter to express our heartfelt apologies for the inconvenience our services have caused. It was an unacceptable fault and should have never had happened.
We have promptly addressed the situation as per your complaints and have taken strict action. Further, we shall ensure no room for such faults to happen a second time to ensure our customers’ safety. If there is any way we can make up for our lapse, please do let us know.
Again, we sincerely apologize for the inconvenience and hope you will forgive us after due consideration.
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