Application for post paid contract (Mobile)

I recently app**** for a Samsung S8 on a 1 gig freeme deal which costs R699 pm, this was around early August 2017 sometime, and my application was done online. This application was processed and approved. 2 weeks later i saw a TV advert for a samsung S8 which comes with a samsung A3 on a 1 gig freeme deal at the cost of R699 pm. When i saw this i called telkom sales dept to enquire about the deal and i adviced them that i would like to change my current order (which hasnt been delivered at the time of me writing this message) to the one advertisedon TV. I was told that i need to do another application from the telkom store and then cancel my current order. I have a problem with this because my application has already been approved and they have all my details and they have done a 1st debit order as part of the approval process. I have been sent from pillar to post with all sorts of reasons why they cannot amend my order, i have called atleast 3 times with the same request and i dont understand why they cannot amend the order regardless of where the application originated from. CAN YOU PLEASE HELP with just amending the order and change it to the advertised deal as seen on TV. Phumudzo Nepfumbada ( ********** 467)