Unhappy with Courier

I've placed an order with Shein and they have requested delivery via Buffalo couriers.

I received my customs amount on Monday 09/10/2023 and paid same immediately. I received my clearance notice on the tracking app 10/10/2023.

On Thursday 12/10/2023 I was requested to send through proof of payment to which I also attended to immediately.

Today 13/10/2023 I contacted Buffalo via the online chat service to find out about my delivery and I was advised by the chat agent that I will receive feedback 3-5 days after someone has allocated my payment. So now I have paid on Monday it is now Friday and I have to wait for someone to allocate my payment when they feel like it and further the chat agent said 3-5 days. I had to ask if this was 3-5 days or 3-5 working days. When the agent responded he/she ended the chat without checking if I was done with the conversation. My second time using these couriers and it is not a good experience. I am extremely disappointed in the way I was treated this morning.