I'm sorry for any trouble caused by the unforeseen circumstances. Sorry for the inconvenience this may have caused. Please accept my deepest apologies for any disruption you might have encountered. Regrettably, we are unable to meet your requirements at this time. Apologies for any letdown this may bring. Apologies for any trouble you may have encountered. I apologize if there were any misunderstanding in communication. Kindly forgive me if my actions have caused any inconvenience. I get it that this must be annoying. Sorry for any inconvenience you might have elicited. Rest assured that we are working to solve the matter as quickly as possible. I sincerely apologize for any disruption you may have faced due to this circumstance.