Dear [Name], I hope this letter finds you well. I am writing to formally request the cancellation of our contract [contract number] effective immediately. It is with great regret that I inform you that we have identified a significant fault on your part which has resulted in our decision to terminate our agreement. Upon thorough review of the contract terms and conditions, it has come to our attention that you have repeatedly failed to meet the deliverables and obligations that were agreed upon. Despite our previous attempts to address these concerns and provide you with an opportunity to rectify the situation, the issues remain unresolved. Your continued disregard for the terms of our contract has left us with no other option but to exercise our right to cancel the agreement. We want to reiterate that our decision to cancel the contract is solely based on your breach of obligations outlined in the agreement. We have made numerous attempts to communicate and resolve these issues, but unfortunately, your lack of responsiveness and failure to meet the agreed-upon deadlines have caused significant disruptions to our operations and have impacted our ability to effectively deliver services to our clients. According to the terms of our contract, cancellation is warranted in the event of substantial and recurring breaches of the agreed terms. Our legal team has carefully reviewed the circumstances and believes that this situation fully justifies the cancellation of our contract. Please consider this letter as our formal notice of termination. We expect all outstanding obligations, including the return of any payments made, to be fulfilled within [specified time frame, e.g., 30 days] from the date of this letter. Failure to do so will result in legal action to recover any damages incurred as a result of your breach of contract. We regret having to take this course of action, as we had initially anticipated a mutually beneficial and successful partnership. However, it has become clear that our professional relationship has become untenable due to the repeated breaches of the agreed-upon terms. We recommend that you take immediate steps to review your operations and rectify these issues to prevent similar situations from arising in the future. We hope that you understand the seriousness of this matter and will act accordingly to resolve the outstanding issues. Thank you for your attention to this matter. Sincerely, [Your Name] [Your Position/Title] [Your Company Name]