Supermarkets!!

I ordered a new handheld mini Dyson vacuum cleaner on the internet over the weekend, to be delivered to my local supermarket. The confirmation said that I could collect my order after 4pm today. I even got a phone call from the store saying that my order had arrived and was ready for collection. So this evening after getting Little Prince settled in bed, checking that Drama Teen and Mr Messy were ok (they've been ill all day) me and LMS set off to the supermarket to collect my new vac. We arrived at the supermarket collection desk at 8.10pm - only to be told by the lady on the next desk that the collection desk closes at 8pm!!! On the dot obviously - there was no one anywhere to be seen!!! WHY couldn't the member of staff who took the trouble to ring me and let me know my order was ready, TELL ME what time the collection desk closed??? For the sake of TEN MINUTES I wasted a 40 minute round trip!!!! AAAAAAARGH!!! I've a good mind to stuff them and go and get it from Argos instead!!!!!