AliExpress complaint: Scam refund system

I ordered a lithium battery for a scooter,,with specific electrical connector. The battery which cost $108 was sent to me with an incorrect electrical plug. This made the battery useless. The seller whom stated on the web site,,,seller pays return shipping, The return address sent on the package said Ben Wang 200 E. Stanley St. Compton , California, I requested a refund,,and a return pre paid shipping label,,since this was a seller mistake. The seller wanted to give my $15 credit to have the battery connector repaired locally. To get the battery repaired locally it was estimated to be approx. $100,, or about the cost of the battery. I requested a prepaid return shipping label. The seller refused,,but wanted item sent all the way back to China, which cost over $300 at my expense. I then filed a charge back with Pay Pal which froze the account. Ali Express then told me to un freeze the account so they could process the refund,,which I did. After the account was unfrozen ,,the charge back was taken off by me. Ali Express then paid their seller,,and now told me I could not have the refund. Saying I must send the battery of $108,, all the way back to China,,for the $300 dollars,,,by my funds,,and no pre paid return shipping label..