You have every right to be frustrated, but the only way out of such situations is by continuing a dialogue, and you will not get much dialogue by personally insulting people you are trying to talk to... now that Sebastian has decided to respond, it is in our best interest to continue a polite conversation about facts... Being polite is not mutually exclusive with being firm. You can and should be firm without throwing sand in a person's eyes. There are no "bad guys" or "good guys" here, we are all human, and people make mistakes. We now got a chance to finally understand what mistakes were made, hopefully straighten this mess, and increase transparency...