Most *********** Courier , why they still in business

Firstly this order I had due to me was for the 16th December, my work closed off for the year forced me to change the address which I did with SHEIN / and was updated successfully. The frustration comes with the courier service and the customer service Team! I called 5 days straight, logged ticket and WhatsApp. Only to be told my address was never updated on the warehouse waybill side I been calling in daily only to be told it will be delivered in 48 Hours , the agent I dealt with was Agent - Tshejosatso can’t even take a simple instruction. They so *********** it’s actually ridiculous how these people still work at a business when all you need to do is update the various teams to align with the customers requirements. So pathetic, if I can choose the courier before it arrives I wouldn’t choose them , and they can’t adhere to there own Service level agreements.