Taken aback by Makro's appalling customer service and lack of internal controls.

I am completely taken aback my Makro's disturbing online shopping customer service! I ordered a double duvet instead of a single one, so I phoned to change it, and they said they would just cancel the order and I can order again. They cancelled this before it had been handed over to the courier. then I get an sms to say it's been handed over to the courier, and then the courier comes to my gate, so I don't accept the order. Then to my total shock, I get an sms saying my order was successfully delivered! I have emailed them, with no success, called them with no success, and even tried to go online to try and do a return product, which it won't allow. I would never try and buy something from Makro again.