I lost my money at Buffalo International Logistics due to their poor service

Buffalo International Logistics service is extremely poor. I paid money for customs duty and VAT for the parcel from Shein to be delivered to me. I kept on receiving emails and messages from them that I need to pay customs duty and VAT OR my parcel is going to be sent back to Shein, whereas I have paid all that. I have been writting emails to them almost everyday, sending whatsapp with the proof of payment and making calls but I am not getting any assistance. Now they will be sending the parcel I bought which so much money back to Shein if I am not paying the money I have paid for the second time. Its really frustrating. Im about to lose stuff that I bought from Shein and the money I paid to Buffalo International Logistics.