I was in Wal-Mart one day and I wanted to exchange a convertor box that I had bought previously at Wal-Mart. I used my goverment coupon. The person in customer service told me I could not get a refund. I told her that I wanted to exchange the box, that I did not want a refund. Then I was told by the same person that the system of the store did not let her do that. I told her to get a manager. Luckily there was someone near by that was a supervisor. The supervisor told me that I needed to get another goverment coupon to be able to get another converter box. I told her that it was not possible due...