Apologise for being vague but don't want to be too identifying and its a bit complicated!
DP has a useful skill (think, plumbing/electrician), is fully trained but is not currently working in the area the skill is due to lack of job opportunities in our local area.
In order to gain experience, he will sometimes take on small jobs from people he knows if they approach him to do a job.
A close friend of DP's recently asked him to do a job for her, he quoted her a price and she agreed to pay it and was happy with the price. Nothing in writing unfortunately. She also agreed to pay the cost of the supplies DP needed to do the job. The agreement was that DP would buy the supplies, provide her with a receipt and she would reimburse him on top of the labour costs previously agreed for the job.
DP did the job, took a few days and all was fine. Unfortunatly DP discovered a problem whilst completing the job that was nothing to do with him, it just happened to be him that discovered it whilst completing the work he was asked to do.
DP's friend was fine initially but when he contacted her to ask when the payment was going to be made, she kicked off saying that he had caused the damage/problem he discovered (even though he didn't) and she wasn't going to pay him. She also decided to take back some left over supplies from the job to the shop they were bought from (with the receipt she asked DP to provide as proof of the cost) and received a refund for them, which she has kept even though it is DP's money.
DP is now out of pocket as she refused to pay for either his labour or the costs of the supplies. Aibu to think this is awful of her and there must be something he can do to get his money back?