1. Despite having phoned you several times about the delivery of my order, it has still not arrived.
2. Although I understand that this is a busy period for you, I do not understand the length of this delay.
3.Your staff is ... Nevertheless, I feel that this situation is unacceptable.
4. In spite giving me some promises, nothing has happened.
5.I have been very patient. However, this will not continue.
6. On the other hand, I don't want to take legal action. I will do...