Poor service

I paid for my son's Xbox on 28 November, scheduled delivery for Saturday 2 December. I spent the entire day waiting. Just before scheduled delivery time, it was cancelled because you couldn't locate my address. You then rescheduled delivery to yesterday before 5pm, still no update or apology nothing came through. After logging in a complaint my delivery was rescheduled for today before 5pm. This is now 5:31pm, there is no update and my delivery hasn't come through. The most worrying part is that there is no contact details to follow up with the courier or talk to anyone from your call centre to escalate my case besides Facebook messenger. What guarantee do I have that I'm going to receive my package intact, that's if it will ever come through?