Dear {Customer},
As {role} of {business}, I would like to like to apologize for the technical difficulties you experienced with our website on {time period} and the inconvenience this caused.
I understand that you had difficulty {getting help/submitting payment/accessibility issue/etc.}.
The issue has now been resolved, and we have {upgraded servers, improved usability, or other action} to ensure that this does not happen again. Thank you for understanding, and for your continued patronage.
Sincerely,
{Name}
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Index of letter of apology templates