Were the Intros and Endings and OTSs the same for each style, or is that an area they changed the style (and hence could charge for as a different style)...?
MidiSpot actually DO give the name of the style used in their songlist, and it is very apparent (at least I thought so) that several different songs use the same style. Caveat emptor, I guess, but double check those Intros and OTSs before you start thinking you've been ripped off...
And contact Nicolas at MidiSpot if you DO find them to be identical, I'm sure that they can address your problems in a fair way...
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An arranger is just a tool. What matters is what you build with it..!