AliExpress Wrong Item and No Money Back Nor Right Item China Internet

I placed an order number 65151456359488 with AliExpress for O Rings for $8 and received a wrong item instead : a printer roller. The order was shipped as a China Post Air Package RI274818999CN.

I applied for a refund and was approved by AliExpress investigation team. Despite this, I have not been refunded the money.

AliExpress claims the money was given to the seller and cannot get the money back.

How am I guilty they cannot get their money back. I ordered an item and paid and was sent a wrong item instead and this was proven by AliExpress themselves. How come they themselves cannot retrieve their money. They only suspended the seller for a week. In case they were to suspend the seller indefinitely, I am sure the seller would have returned the money.

I am able to return them the wrong product after they pay for the postage back.