Online shopping and call centre disappoints

I decided a month or so ago on a Sunday afternoon to register for online shopping with Woolworths. I got stuck at the point where I had to select my delivery address and the time of delivery. I tried a few times, thinking I just did not understand the tech stuff. I called the call centre and was told that it was clear that the problem was a system problem at Woollies. During the following week, I again tried a few times to order online. Also called the call centre and discovered it does not operate 24/7. After a few more attempts, and not having received any callback, I called the call centre again, and this time was requested to send a screen shot of my problem, which I did. I have not yet received an acknowledgement of receipt and nothing changed: as of last night I still cannot get past the delivery time page.