Poor customer service

On the 7th of April Buffalo logistics sent my package to fast way couriers. On the 10th it was due for delivery, till today I have not received my package. Every after to send days they send me emails that my parcel is out for delivery, when I check the status they sent it back to south bay/ east bay. Honestly this is unacceptable !!! They are not responding to emails, WhatsApp nor phone calls. I have to wait for 7 more days for shein to conduct an investigation 😡