I'm sorry for the inconvenience caused by the unforeseen circumstances. My apologies for the inconvenience this may have caused. Please accept my deepest apologies for any disruption you may have experienced. Unfortunately, we can't to meet your requirements at this time. Apologies for any letdown this may bring. Apologies for any trouble you may have arisen. I'm sorry if there was any confusion in communication. Kindly pardon me if my actions have brought about any inconvenience. I understand that this must be frustrating. Apologies for any frustration this may have caused. Please be assured that we are working to solve the matter as quickly as possible. I sincerely apologize for any inconvenience you may have faced because of this situation.