Buffalo logistics and lies

I ordered from SHEIN and my staff were delivered in Buffalo logistics in S.A, prior to this I had already paid for customs. I received an email from SHEIN informing me that my package was lost and asked me if I want the clothes I had ordered to be reshipped or choose refund and I opted for Reshipment. On the 25th I recbeived an email from buffalo stating that I must pay customs and I'm asking them why must I pay when the 1st package got lost when I had already paid customs. They keep saying that my 1st package got lost due to alleged hijacking🙄. I keep telling them I need my refund cause I want to pay customs, I can't pay customs twice and according to their WhatsApp, they refund only the package was hijacked of which that is exactly what happened. They've decided to ignore me even after sending them an email from SHEIN showing that they must be the ones to refund me. Service is utterly disgusting and I hope SHEIN allows us to use another courier company because buffalo is full of sh*t.