Sonic Drive-in

I am currently in love with mango slushies with strawberry in them I have gone to this Sonic twice in the last week for one and have been left wanting both times. The first night it wasn't very slushieish but I attributed that to the fact that it was 8pm and maybe they were shutting down the machine, I put it in my freezer for a bit and it was better. However I went today and they said it would be a couple minutes because they just turned the machine on, I had no problem waiting. About 30 seconds after I parked they brought it out and I drove off. When i finally put my straw in it, it was pure liquid, they didn't even put ice in it to make it really cold. I will not be going back to this location for my slushie fix.