Lost/ ****** package and terrible service

On the 15 November 2024, I placed an order on shein and on the 26 November 2024 my parcel was out for delivery, However that day I had not received anything. Later that night I received an email informing me that my parcel was returned to ITT courier service warehouse in Graaff Reinet. From that day, I kept calling both Buffalo International Logistics and ITT Courier to track my parcel. A lady with the name Linda at ITT courier confirmed me that on their system, it shows that my parcel is with them however, they couldn't locate it. On the 13 January 2025, I informed both buffalo International Logistics and ITT courier about my missing package. 2 days after my complaint, they updated my status to read that my package was delivered whereas that is false. Its been a back and forth between myself, ITT courier and Buffalo International Logistics. All I want is for my package to be delivered, if not, they must refund me. I am very dissatisfied with the treatment I received throughout and I have concluded that Buffalo and ITT Courier company doesn't take their customers serious.