Rude, unhelpful and unprofessional drivers and call center staff

No proper communication on deliveries. Call centre staff and drivers are extremely rude and unprofessional. They shout at you over the phone saying they only have 3min per delivery. I asked if I could add a note to the delivery on what button to press on the intercom and was told no, the driver will call before the delivery. I told them that the drivers don't call before, they only call when at the gate. They said "well that's the way the drivers work and there's nothing we can do about it". Shein products are good, but the logistics with BUFFALO is **********. The driver threatened to send my parcel back to China because I missed his call and called back. I asked whether they will deliver the next day, and he said no we are not coming back your parcel is gone. After being shouted at, I just said it's fine I won't order from Shein anymore so that I won't need to use your service. What about old people or disabled people who cannot race to the gate in or less? Absolutely disgusted by Buffalo, drivers and call centre staff. Please advise how to raise this with Shein.