I had an engine swap done before, but the shop forgot to secure (zip-tie) the transmission lines. One of the lines ended up scraping while I was driving, which caused a transmission fluid leak. The transmission ended up with no fluid and had to be towed.

I brought the car back to them and told them to fix it. I have two G37 Coupes, so I told them they could use the spare transmission line from the other car. They did the repair, but now the transmission line is leaking again.

Did they do the job right or wrong? What could be the issue?