The word 'Texas' always gets my attention, and while I am reluctant to weigh in on this, I will.
My impression is that Slingin is not taking care of business: namely, how does a bank computer glitch turn into a hot check charge? I don't know the facts here, but I would have done anything needed to not have let that happen - a lawyer comes to mind here.
Also, knowing there are no refunds for the class or application, I would have, and did, carefully check my stuff before I applied.
A CHL is serious business, not cowboy town at Six Flags Park.