Terrible customer service for a 'premium' brand

This afternoon I walked in to the Brooklyn iStore at 4:30pm (30minutes before closing time) to upgrade my contract and the shop assistants were already closing the doors.

I was greeted by a shop assistant with a lacklustre attitude saying that he will need to see if they can help me because they don't usually do upgrades after 4pm. I find this unacceptable as Vodacom was still doing upgrades at this time and would not turn a customer away even when walking in 10minutes before closing time.

He then proceeded to ask who could help me and everyone looked around as if to say 'not me', and eventually one of the shop assistants came over to speak to me. He indicated that I would need my ID and proof of residence (for which I had my bank statements). He then said that I could produce any form of proof of address other than bank statements (this is not stipulated on the website and seemed terribly convenient as it would mean they did not need to help me today).