you've lost a customer

I placed an order for nappies on their site on Monday. and the soonest they could deliver was the 23rd . I was hoping it would be delivered sooner. but just held my hopes. I needed the nappies asap and they are only available online can't get them at other stores. so I had no choice. I received a message today that my parcel will be delivered today. so I made sure I was available at home all day . 5pm comes and no parcel . call them and they say it's promised delivery by the 23rd . I'm ****ed off because I was informed that I'd receive delivery be for 5pm today . the lady on the phone then proceeds to tell my husband that the parcel will be delivered tomorrow as per their system . I'm ****ed off because I was told different and wasted my day waiting for this ****ing parcel I really need. to be told I am wrong . instead did following up with the driver or checking what's happening the lady just tells my husband some prescripted *******. this may seem like an extreme reaction but I'm tired of being messed around when I've paid for a service .