A email/letter of apology to customer for an error made in a marketing material recently distributed. It gives a detailed description of the error made and encloses a revised copy. It also reassures customer that a process review is underway to avoid similar type of error happening in the future.
We are very sorry to inform you that [a typo / an error] has been found in our [marketing material / brochure / catalogue / price list].
On page [x] under the item [Item], the original description was:
The correct description should be: