The correct answer to this open question is the following.
Although there are no options attached, we can say the following.
The level of government you would contact to make sure you receive your G.I. Bill benefits is the federal government.
It is the federal government to confirm that you receive the benefits of the G.I. bill.
Here, we are talking about one of the most important legislation of the time, that helped veterans to get a good education.
The United States Congress enacted the G.I. bill in 1944, benefiting veterans that participated in World War II because this legislation supported them to attend school and get a good education. Approximately 7 to 8 million former soldiers received this benefit.