Delayed SHEIN order

I have been waiting for my parcel, was last updated on Sunday that it's in transit to the third party express. I have not received any communication since my parcel was ' handed' over to these people. I need my order before Thursday. The landline number is not working for buffalo couriers the option for the WhatsApp number, there's not response. I've really ran out of options on how to communicate to find out where my order is .