Having read with interest all the postings it seems to me that two issues are here!
1) D+P Design although offering a Free design service perhaps have suffered serveal people using them and buggering off with the design to be printed elsewhere? Hence the telephone converstation asking for payment. A change of wording would be wiser, perhaps free artwork on completion of order or artwork charged at £x x x per hour if order not placed? This keeps it nice and clear for all concerned.
2) You get what you pay for, it apears a lot of you are complaining that the service is not good etc.... yet no one is complaing about the reasonable prices. You can't have it both ways.
I have used D+P for all our stationery, found Mark to be helpful, a little difficult to get hold of, but the finished product was of a high quality and all in all very happy with the jobs he has completed for us. I have used designer services before and believe me they are very expensive.
I think in general the main reason for this posting was due to a breakdown in communication. Obviously puuting the phone down on a customer is not professional, but lets face it, if as it has been stated, he works to small profit margins and encourages high volume traffic, then I guess as with all of us, sometimes you just lose interest in an account or customer and think this really isn't worth it and bin them?