Make them spend time on you. Take the interview, ask questions, make them set you up on the payroll; ask to have more income tax deducted at source, ask them to accomodate your complicated scheduling constraints, etc.
Then, on the day when you were supposed to show up, when they call you to ask where you are, see if you can play this over another day: it's not your fault, your car broke down and your phone was out of battery, whatever. It hurts them way more to be missing workers they were expecting than to have people just turn them down right away.