Miss D you have taught me a valuable lesson!

I had a customer with a broken system caused by a lightening strike - out of warranty so I quoted €400 for the likely replacement part (a satellite modem) and €100 for the service call.
Today he calls and wants to drop the part in to save the service call
Meet him in the village, collect the modem and put it on test - it is buggered, deceased, an ex-modem.
Send an e-mail to his Blackberry telling him is is fooked and the replacement is €400 and he calls me straight back...
Customer: No problem, can it wait 'til the first week in April?
Barman: No hurry at all
Customer: I'll pick up the modem this arvo then?
Barman: (thinking of how Miss D tricked him) You want the modem without paying me for it first? I don't
think so!
Customer: I'll cancel my subscription then!
Barman: Okay, bye, bye...
