I'm sorry for any trouble caused by the unexpected circumstances. Sorry for any inconvenience this may have brought about. Please accept my sincere apologies for any disruption you may have experienced. Unfortunately, we are unable to meet your requirements at this time. Sorry for any letdown this may cause. Sorry for any trouble you may have encountered. I apologize if there were any confusion in communication. Please pardon me if my actions have brought about any inconvenience. I get it that this must be annoying. Sorry for any inconvenience this may have elicited. Rest assured that we are working to resolve the matter as quickly as possible. I'm truly sorry for any disruption you may have faced because of this circumstance.