I try not to get involved in moral dilemmas, but I feel for you here!

You have a right to get a working device first time. I’m not impressed with TE quality control or aftercare, I’ve bought 9 POs, only 5 still work, and I case them with the clear perspex cases which are very strong.

The OP-Z I bought from them felt flimsy, luckily I sold it on before all the reports of bending and double-trigging began emerging.

Sometimes the law and morality dont quite match up. In the UK by law you have 14 days to return anything you bought online. Some people use it to continually try out music gear for free.

Technically legal, but for me personally (Im not judging anyone else, we all answer to our ourselves ultimately) I wouldnt do that, it feels wrong. I would however do what you did, because it wasnt your fault to receive a broken product, you bought it in good faith, and ultimately the outcome is the same as if you’ve returned it to TE, minus the hassle.