Your supervisor has been at the mimimum very rude, and certainly if your data is being used in a publication then you (as a PhD student) should be involved in the writing - how else are you going to learn about getting published?

I think there are consequences, and I think you need to sort this out now. OK, having papers published helps with the PhD as it is a validation by your peer-community that your research is worthwhile. But will being third author on a paper that you havent written but to which you have only contributed data help you in this regard? I'm not sure. It could work the other way around - that it looks as though in the PhD thesis you are using stuff that was done by the first and second authors.

Can you go and talk to someone else? Do you have other supervisors?