Verb conjugation of "hammer" 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.
Thank you for your email! A little question about yourself. How old are you? I think the Americans are using the word color and not colour, but I understand if you are not sure about it.
Have you ever visited the U.S. before and if so, where have you been in the U.S.? I've been travelling in California, it was very amazing. We have traveled by car. Here are my corrections.