Good service hampered by bad South African depot policy

I ordered an item from AliExpress on 24th August with an estimated delivery date of 08 September. I got a call on 9th September to say it was at customs and i should make a payment to the account provided... I promptly paid and called back on Monday 11 September and the lady confirmed that payment was received delivery will be for today, 12 September. I havent heard from them all day and upon calling back (what a mission it is to call their call centre, getting stupid automated AI that doesnt understand even number inputs), after numerous attempts I eventually get through to a consultant who advises me that shipping will only be delivered on 18th September, a WHOLE week while its at the Fedex Cape Town Depot. I dont understand this policy. We pay premium to have it delivered faster but according to them I have to wait 7 more days before they deliver, especially after they rushed me to pay customs, promising to deliver the next day, only to find out 7 more days.