Apology mail to client for mistake in service

Here is an example of an apology email to a client for a mistake in service:

Subject: Apology for the Mistake in Our Service

Dear [Client's Name],

I am writing to express my sincerest apologies for the mistake that occurred in our service to you. We take full responsibility for the error and are truly sorry for any inconvenience or distress it may have caused.

On [date], we [briefly describe the mistake, e.g. "failed to deliver your order on time" or "made an error in your invoice"]. We understand that this was not the level of service you expected from us, and we fell short of our commitment to you.

Please know that we are taking immediate action to correct the issue and prevent similar mistakes from happening in the future. We are [briefly describe the steps being taken to correct the issue, e.g. "re-delivering your order" or "re-calculating your invoice"].

We value your business and appreciate the trust you have placed in us. We want to assure you that we are committed to providing the highest level of service and quality to our clients. We will do everything possible to regain your trust and confidence.

If you have any questions or concerns, please do not hesitate to contact us. We are here to listen and make things right.

Once again, we apologize for the mistake and any inconvenience it may have caused. We appreciate your understanding and look forward to continuing to serve you.

Sincerely,

[Your Name] [Your Title] [Company Name]

Additional tips:

Remember, apologizing to a client is not only the right thing to do, but it can also help to maintain a positive relationship and prevent negative word-of-mouth.