I'm sorry for any trouble caused by the unforeseen circumstances. Sorry for the disruption this may have caused. Please accept my sincere apologies for any inconvenience you might have encountered. Regrettably, we are unable to meet your requirements currently. Sorry for any letdown this may bring. Apologies for any trouble you may have encountered. I'm sorry if there was any confusion in communication. Kindly forgive me if my actions have brought about any inconvenience. I get it that this must be frustrating. Sorry for any inconvenience you might have caused. Please be assured that we are doing our best to solve the issue as quickly as possible. I'm truly sorry for any inconvenience you might have faced due to this situation.