Builders online orders are a mess

I ordered some items online. After a few days the order was marked completed without any communication from the company on that. I gave it a few days to be delivered but nothing appeared. At that time I started calling the support desk and got nothing but “We are investigating” with no real detail or explanation why my order was in that state. After 2 and a half days of enquiry and escalation I got an explanation about stock issues and a callback in a few minutes. Again a day later comms have stopped and I still have no indication of how this will be resolved and the order is still marked completed. The am really dismayed that it takes 2 days to get an update and that their systems marks orders completed before it is even despatched. Ans now I am asked for feedback with no resolution.