由于种种原因而给你造成的不便，我表示歉意。
Due to many unexpected reason, I am really terribly sorry for any loss made to you.
认识到我们的疏忽给你造成的不便，我们将竭尽全力避免再耽搁。
I realize the inconvenience our oversight must be causing you and will do everything possible to avoid any further delay.
我们非常抱歉对你造成的困难。为这件事情而给你造成的不便请接受我最深切的道歉。
We are terribly sorry that we made so trouble for you. Please accept our deepest apology for any inconvenience this matter has caused you.
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