"He told me he would resend the item"
That is a common lie told by sellers in China. They had no intentions of sending you another item. They tell buyers that so that the buyer will not file an item not received dispute within the deadline.
Since it has been 4 months, you can't file any disputes against the seller.
Unless you like cheap qualitiy, inferior, sub-par items, do not buy from China.
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Non payers should get unpaid item strikes and be added to block bidders lists. Period.