Bought items from seller but did not get all of my order

Bought some items from a seller but didn't get all of what I ordered so contacted seller they said because they had photo of order I was a liar what do I do. They have told me to expect negative feed back since I gave them negative feed back and have told me they are going to block me from buying from them in the future have bought from them several times over the years had no problems until now
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If it's under 30 days since arrival of the goods and you paid by Paypal, you can start a return process through eBay's MBG, or if it's over that time period you can raise a dispute through Paypal.