I went to pump gas on an Arco gas station on Avalon and 213th St, in the city of Carson, paid on the automatic payment machine outside $30 in total. Apparently only $10 went through according to the cashier but it shows $20 for change but he wouldnt give me my change or let me pump $20 of gas. He told me to leave my number and IF they went OVER when they open the machines( which is two days later), they might give me a call. In the meantime I only have $10 of gas on by truck for the week, and I'm short of $20.