How to apologize to a customer
A customer apology is not a novel. Own it in one line, name the specific fix, offer a make-good if you can.
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Three ways to say it
“hi, i'm so incredibly sorry for the mixup!! we sent the wrong item and that's completely on us, we're rushing the correct one out today and refunding shipping”
We shipped the wrong item. That's on us. Correct one goes out today, shipping refunded.
“hi, please accept my apologies for missing the deadline last week, that shouldn't have happened and i take full responsibility, i'll have the deliverable to you by end of day”
I missed the deadline. That's on me. You'll have it by end of day.
“we're so sorry for the issue you experienced!! we identified the bug and have deployed a fix, please let us know if you're still seeing anything and we'll make it right”
Bug identified and fixed. Please let us know if you're still seeing it — we'll make it right.