I can appreciate that this is irksome, but in all honesty I don't think there are any grounds for requesting a refund. All sorts of series don't get completed for any number of reasons, and not having access to the final part of a series doesn't change the content of the first three parts. I'm not unsympathetic to the situation, but in such a circumstance if having the complete series is high on your priority list, the sensible thing to do is to wait until the complete series is released before buying any of it.
I dislike "serial" releases for this reason. There is never a guarantee that the story will be finished and/or accessible to you. It's a classic case of "caveat emptor".
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