Did I make a mistake

I joined your bank because I thought you would be better than my previouse bank. I slept with funds in my account last night. I woke up this morning with a R0 balance. I'm starting to regret joining your bank. What should I do? Should I change banks again? I'm loosing out on my miles for a negative account. Please resolve this issue. I cant be loosing money because of funds I have already spent just because they haven't been banked by the shop I bought from.