Buffalo International logistics poor customer service

I ordered a wig on shein and requested for a return and refund because I wasn’t happy with it. On 02 December 2024 Buffalo sent their driver by the name of Zuko Ngqoko to come collect the refund. The return status on shein changed to “ parcel collected by Zuko Ngqoko” and was like that for weeks. I contacted the driver to ask what happened to the parcel and he advised that the parcel was lost and buffalo knows about it. I tried contacting Buffalo about the matter and they have been dismissive about it. I called them from January till August begging them for my refund as shein advised that they are the ones who should refund me as they are the ones who lost the parcel. Till this date, a year and a month later I still haven’t received my refund of R1500. I have been emailing them and they keep on saying they cannot help. Buffalo is a big courier company but their service is very poor. They mistreat their customers. Till this date I am still trying to get my refund from them. They lost my parcel but refuse to pay me. They even gave me a return lost letter in their letterhead to send to shein. I would really love to get my refund without fighting this much as if it’s my fault they lost my parcel.