Service (non) Delivery from Buffalo International Couriers -inefficient systems

This courier service is designed to make profit with zero appreciation for the client. I bought clothing online from China, I paid immediately when I received the message for my goods being delivered to South Africa. They do not respond on their WhatsApp line and calling always ends up on a dead end after being put on a queue. They do not give feedback to emails. I have no idea if they receive their pay even though I sent proof of payment, I’m still uncertain on what to expect. It’s beyond 4 weeks of waiting and still I get email reminders of payment but nobody to attend to the queries. Instead I got an auto email back telling me that their running behind schedule and that I should not send emails that will clog their system. How hard can it be to just confirm that you received the payment and commit to a delivery date hopefully this year ? Appalling service (non) delivery. SHEIN must get another partner to courier in South Africa