Question refariding overture and money deposits/budgeting

So i have this campaign which is not doing too good (same campaign using adwords does awesome btw) and i wanted to finish it with the last 15 bucks from the last deposit. But ofcourse overture charged my card again for 30 bucks. So i set the budget to something really low so i can find out how the money deposit thing works and guess what, i wake up to find out i'm charged 30 bucks again while i still had 20 bucks left from the last charge! So now i have 50 bucks in my account. How can i spend those 50 bucks on my campaign without being charged again tomorrow? I really cant find an option for that.

 

I think you need to call them up in order to close the account.

 

Yes and call them quickly. $30 bucks a day, adds up fast