Dear {Customer Name}
Please accept our apologies for the inconvenience {the issue} has caused you.
We strive to deliver the best that our customers like you deserve with a strong suite of products, high-quality customer service and unfailing quality assurance. Unfortunately, the issue that you experienced went unnoticed through our process due to {recent key staff changes, recent internal system update, office relocation, etc…}.
At {Company Name}, we are always innovating, and we have taken steps to prevent issues such as yours from happening again by {creating company wide training sessions, installing new back-up systems, creating an internal auditing team, etc…}.
{If additional action is necessary:}
Because we value our relationship with you, we are going to provide you with {3 months worth of service, a free upgrade, etc…}.
If you have any further questions or comments regarding this matter, please feel free to discuss it with us at {email, phone#, website, etc…}.
Yours in service,
{Company Representative}
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Index of letter of apology templates