Willing to Lose a good customer?

I have been a loyal, well paying client of Telkom Mobile for 3 years. I went in to migrate from my current Wifi package (Home LTE 20GB) to change to the Uncapped LTE Wifi package. My account each month is increasing due to me having to do top ups every month, therefore i want to change to the uncapped, which will SAVE me money. I was declined. I don't care what the reason is; i have been a loyal customer who pays up to R1500pm for my contract, and WHY would i be declined if im trying to LOWER my monthly expense?!!! I have done a migration before, and i had NO PROBLEM, i expect that same assistance this time, since i am trying to SAVE SOME MONEY! I WANT MY WIFI PACKAGE UPGRADED TO UNCAPPED R699pm OR I WILL CANCEL MY TELKOM CONTRACT! This is ridiculous!!! I pay every single month, despite how much i am now paying. This uncapped deal has been a nightmare from applying online.i called 3 different numbers, each time waiting over 45mins just to get through to a call centre agent, only to be told to call someone else; they know nothing. After i was told i was declined a new contract, i went in store to MIGRATE, and they had no hardware stock. I eventually get the stock - DECLINED!