I did some work for a ( so called friend ) some time ago at the end when I gave him the jet at the field he spected me to prep his jet for a flight, again but I was to buise with mine, to say the least, he took off, didn't even say thank you, did not pay for the service or the parts that I bought with my own money for his jet, a week later nothing, I have seen him like 20 times since then and nothing, any one that flys rc within 100 miles from our field knows this guys reputation and we are getting sick of his lies and his precence. My advice, remind him/they that you spend your own money on parts for that jet that they have sold and that you will like the rest of your money back by now 'cause you have given them enough time and that this will be the last time you ask.

From there it should be know that they/him don't pay for sarvices.