I had a similar situation a while ago.
A young woman took a Lancer to VTNZ and was failed on a couple of minorish things (cant remember what it was), they brought it us (mitsi dealership) and got us to fix it, then realised they were over the 28 days and asked us to do a wof. Yeh sure, thats easy. Problem, the car had less than 100mm ground clearance front and rear, plus the front springs didnt fit the shocks correctly. We went through the ususal process of pricing the job to fix it, new front and rear springs (kings), ended up about $500 ish.
So we inform the customer, for a week I got a phone caal from the womans father everyday because he couldnt get his head around it, ends up calling me every name under the sun and says he will take the car back to VTNZ and bring it back and show me the wof. Unfortunately he never came back in. I was looking forward to it coming back in for the spring replacement and rubbing it in his face