Join Date: Oct 2000
Location: Munich, Germany
Programs: LH HON, DL FO/MM, Marriott Lifetime Platinum, Accor Lifetime Platinum, Sixt Diamond
Posts: 6,174
In that case, I would say you should DEFINITELY WRITE A LETTER and NOT complain through the website.
Explain your feelings and how it affected your plans, and lists possible out-of-pocket expenses you might have had due to the delay.
I would say a $200 travel voucher should be the minimum amount for such a problem.