Bad costumer service

This people contacted me around 8August 2024 and approved me for a cellphone contract before it can arrive I decided to change my banking details as I moved my salary to the different bank it's seems all they need is just sales nothing has been changed ,I have refuse to take delivery for 8 times,I have been complaining to customer services nothing has been done but courier are always calling that they have my parcel.even today 30October 2023 I received text from couriers that the have my parcel.if they can't resolve a simple issue for three months what will happen if I take their contract