I noticed it says under the spec requirements :
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Important Information:
For this expansion/dlc title, the base title is required and needs to be installed on your machine before you can access this content.
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You should contact them since this is a mistake, the game doesn't need GTA 4 at all, so it may probably think the CD Key will run from the "base title's" one.
EDIT : Also about purchase history. If you'r paypal, credit card or whatsoever thingy e-mailed you that you've purchased it, then you can show them that.
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