SCAMMED on Ali express

I purchased a pitbike thru an Ali express add. $1126 shipped to my door ( 826 for bike & 300 for shipping… I Communicated with the seller via what’s app for shipping & tracking fine. Up until the bike got to the port… this is where the scam takes off. In the tracking site they tell you your items is at the port & you need to pay for “Port Of Entry - United States On Hold For Insurance & Assessment Fee ($987USD). Refundable fee” which seems normal at first…. I’ve paid tariffs and fees when purchasing thru yahoo auctions. So I sent them the $987 for payment. The very same night after it was released less than 24 hrs tracking was updated with another fee “Port Of Entry - United States On Hold ( VAT fee $755, Import duty $865. Total $1620). Refundable fee” I got into it with the seller alredy pissed that my 900 bike bike was becoming more of an ordeal… alredy pissed not wanting to loose more time I sent them payment for $1620. Now tracking updated with $630, Delivery Fee $500 & Handling fee $340. Refundable fee $1470). Final Payment which is also refundable and that’s where I decided I’m in way too much over my head.. on this purchase I’m already $4,000 negative. No bike they don’t want to refund me anything I’ve tried contacting Ali express and my banks to put a stop payment on the last transaction since the first few have been over a couple days already they can’t do anything… just want to put my experience out there to shed some light & hope nobody else falls for it