sorry

I am so sorry that I forgot to call you on your twentieth birthday.

(Chinese) 真抱歉，我竟然忘了在你二十岁生日那天给你打电话。

The company felt sorry for the mistake and offered a full refund to all customers.

(Chinese) 公司对这一错误感到抱歉，并向所有客户提供了全额退款。