Poor service from Buffalo

Im expecting a parcel from SHEIN. Buffalo drops the call center lines, they don't respond to the whatssap line and the email address provided to resolve issues they don't respond to it. I can see that the delivery guy sent my parcel back to warehouse and I have no idea why!! There is absolutely no way to get in-touch with buffalo through all their channels. Im very disappointed at this poor service, they are absolutely unreachable!! Pathetic!!