Dear Mr.Mrs. xxx,
First of all, I'm deeply sorry for the trouble we caused and please understand our company take your previous email seriously and promise not to make any inconvenience to you ever.
In your email, you firstly mentioned our service fee was too high. I have to say that, based on our company's policies, the economic situations and the raising cost, our service is really worthy your money.
Then you mentioned our repair service was not in time. Please understand it's not how our machinists usually do, the delay in your case was an accident in time communication and misunderstanding, and it won't happen again.
At last you pointed out that our machinists were not in good manner and temper. I, on behalf of them, hereby give our sincere apology for that and will train our men to be more professional.
If you have any other questions, I'm always available at XXXX(寫電話). Looking forward to your call and hopefully we could talk about future cooperations. Please give us a chance to let you believe in us again.
Sincerely yours.
xxxxx