you know what to do.. tell everyone that calls, you need a deposit paid within 24/48/whatever hours and stick to it. the same with emails.
I only do business via email, when someone phones me I tell them I will mail them a quote, this serve 2 purposes.
1. It gives me time to work out a proper price, not just pluck it form the air,
2. to me the most important, at the bottom of EACH email I have in bold red letters, no date is booked until the deposit is paid. It...