I am writing to apologize to you for breaching our contract. I understand that this breach has caused you inconvenience and I want to express my sincerest apologies.
I take full responsibility for the breach and want to make it clear that I am deeply sorry for any issues this has caused you. I understand the importance of honoring our contract and I regret that I have not done so.
I have taken steps to ensure that this does not happen again. I have reviewed our contract and have taken measures to ensure that I am better able to meet the terms of the agreement. I have also taken steps to ensure that I am better able to manage my time and workload, so that I can meet all of my commitments.
I understand that this breach has caused you frustration and I want to make it up to you. I am willing to do whatever it takes to make this right. I am willing to negotiate a new agreement that meets your needs and is more beneficial to you.
Once again, I apologize for breaching our contract and I want to make it up to you. Please let me know what I can do to make this right.