Okay, I understand it now.
Acknowledged. (收到信 ; 承認~)
I will follow your instructions. (我會依照您指示的做)
I got it with thanks. (我懂了) 口語，平輩較適用 get-got-got
We acknowledged your order of May 5th for 100 unit motorcycle P180.
We have decided to accept your order in spite of the current shortage of the goods.
We promise to give our best tension to the execution of your order.