I remember your case, and I have all the documentation on file: The Unit was repaired for a very low fee, and it was marked to be especially delicate in the corner where you (or someone else) damaged the track. Damaging the track in the first place took quite some mechanical force, and if that has happened in your surroundings, I should have known in advance that it's not enough to hand over the unit with the words "it's delicate equipment".
It seems like you're the kind of customer that I won't be able to satisfy. I'll make sure that you'll get a refund. Our expectations of a working B2C relationship are too different; Please do me a favour and don't buy my products any more in the future.