Undelivered order

I ordered 14 items on the 25th of September and paid Buffalo Logistics customs fee and till to date my order is still missing, no communication whatsoever with both Shein and Buffalo,I've called Buffalo and they told me that my order was sent back and they said they have no idea as to why the order was sent back. Buffalo said I need to inquire with Shein of which I tried time without number to call and whatsapp but all their methods of communication are not available and when I track the order it says my goods were lost I must wait for the refund of which its been more than a month wait