Failure to deliver & inaccurate info from staff

I have a very important parcel scheduled to arrive today (Tuesday 10 Oct). I called to make sure all is on track since it is so important but the staff tell me I will only receive it in three days time EVEN THOUGH IT IS READY TO BE DELIVERED and all payments were successfully made and cleared. DHL promises to deliver on a specific day and then they say all will be delayed because they are using a third party to deliver the parcel AND that they only deliver on Mondays and Thursdays. I called again to talk to a different staff member to see if it would be different and then they said it was on its way to me. Still no parcel so I called again they said no it will only be delivered on Thursday. Horrified by false delivery promises and the poorly trained staff. I will never use DHL again. Had I known upfront they would fail to deliver on their promise I would never have used them. They say the only option is for me to collect from them myself - I cannot do this so now I must arrange another courier company at an additional cost to collect on my behalf if its really urgent. This is beyond belief!