Dear Sir Madam:
I am writing to complain about the poor service provided by your bus company.
Last saturday morning at 8:30,I came from Xi'an to Bao Ji to participate in my sister's wedding,but unfortunately the driver from your bus company violated the regulation.He drove out late for about half an hour.Moreover,he waited for other people on my way.As a result,three hour's trail took me more than four hours.This action made me miss the wedding at 12:00.Seriously,the driver refused me to change another bus and give my bus charges back to me.I can't help controlling my terrible mood ,so I hope you can help me solve this matter at hand as soon as possible so that it will not happen any more.
Thank you.I'm looking foward for your reply.
Seriously,
XXX
有时间还是自己练习写一下吧,按照大概意思写120字的,没太大问题。