ご不便をおかけし申し訳ございません。
I am sorry for inconveniencing you.
We are sorry for this inconvenience.
I am terribly sorry for causing inconveniences.
I am terribly sorry for bothering you.
I am sorry for causing you such inconvenience.
I apologize for causing you a trouble.
I am sorry for inconveniencing you.
I am terribly sorry for causing the inconvenience.
I am terribly sorry for bothering you.
I am terribly sorry for causing you trouble.
We are sorry for the inconvenience.
I'm very sorry for troubling you.
I am terribly sorry for causing trouble.
I sincerely apologize for the inconvenience I have caused.
I'm very sorry for bothering you.