Appalling service

Buffalo International Logistics has the worst customer service ever. I requested a return of goods via Shein(BUFEX***YQ) and I was sent a message by Buffalo International Logistics that my parcel would be collected in 2 business days, this was on the 3rd. Today is the 12th and I have been trying to get hold of them from the 4th. When you call you never get through due to high call volumes, when you email they take 5 business days to get back to you and when you try their WhatsApp number, you get a robot. I finally spoke to someone today and I was harshly told that my return address was incorrect. Meanwhile no one informed me of this, the lady just said I'm just telling you what's written on the system. Buffalo International Logistics is by far the worst international logistics company that I've ever had the displeasure of dealing with.