Lack of urgency and commitment to delivery date to brands using their service

I've made an order with next which I require for the 17th of April 2021, next has assured that item will be delivered by the 16th of April by skynet .on the 13th of April Dalene from Skynet has contacted me for payment of customs and duty at 3:41 pm and immediate payment was made and pop forwarded along with my ID number at 3:58 on the 13th of April... to date however I have not recieved the link with for the clearing instructions form- I had called Dalene on the 14th of April and she had advised that I would recieve this once the parcel is shipped tonight the 14th of April from the UK and is on route to SA however my tracking shows that the parcel is in south africa Johannesburg ...Please may this matter be urgently expedited as I urgently require this parcel for the 17th of April and the delivery date is the only reason as to why I made this purchase in the first place. Otherwise I could have locally purchased a brides**** dress..