Disappointing customer service and not honoring promise on delivery

I am meant to receive a Parcel from DHL, per their waybill tracking service, on the 19th of February 2021, between 08:30 and 16:30. The date now is the 22nd February 15:30 and still no parcel and no one from DHL has bothered to notify me as to what has happened to my parcel. I called on the day on which I was due to receive it, at 16:30 once I had noticed that the parcel was really not making its way to me. The consultant from the customer service center was really not helpful , all she could confirm was that the parcel had been re-routed to a third party provider : RAM and she will send me an email to confirm this, to this day , I am waiting on this said email. I asked her how this was possible as I have dealt with RAM , many a time with other companies and I know they call and SMS you way before hand to confirm your delivery and details. Needless to say I then followed up the following Monday and still don't have my parcel , and I am being given the same reason that the parcel is with their third party provider: RAM. Yet no one has bothered to notify me of any of these changes or delays. Their tracking site still says my parcel will be delivered 19 February 2021 it is 3 days past that date and I still have not received my parcel. This really is shocking as well as disappointing also your customer service support does not honor their promises and this is appalling.