No feedback on MISSING order

I ordered on SHEIN on the 5th of August, paid customs etc. My order was apparently out on delivery last week; however, no delivery was made. Instead, Buffalo claims that my number is incorrect or that I did not answer the phone (all lies). Delivery was rescheduled twice, but today the customer service agent told me that she thinks the order is missing and has never been out on delivery. TERRIBLE, TERRIBLE service from Buffalo Logistics. I hope Shein will revisit their agreement with Buffalo. We need a better service provider. I am awaiting delivery of my parcel.