Verb conjugation of "dam" in English

The billing of additional working hours is not justified, since it was our request to download the software and wait for the new version. They have admitted the error of the translation.
I had never heard the phrase before. In America, there are also different idioms than here in England. It seems that the Americans say it differently than we do here in the United Kingdom.
I have made an internship at a law office, but just for two months. Their salary is really bad. Now to my promise to correct your long message. You need to say: 'On Friday' not 'At Friday'.