I'm sorry for any trouble caused by the unexpected circumstances. Sorry for the disruption this may have caused. Please accept my sincere apologies for any disruption you might have encountered. Regrettably, we can't to meet your requirements at this time. Apologies for any letdown this may cause. Sorry for any inconvenience that may have encountered. I'm sorry if there was any misunderstanding in communication. Kindly pardon me for any actions have caused disruption. I understand that this must be frustrating. Sorry for any inconvenience this may have elicited. Rest assured that we are working to solve the matter as quickly as possible. I sincerely apologize for any inconvenience you might have faced due to this situation.