Telkom denied me an upgrade on the deal of the month.

I asked Telkom concerning upgrading my mobile. Both the shop(Springs) and Call Centre said I cant upgrade to the deal of the month. If i want the deal of the month, I should take a new contract. I told them that's not good for me as I have to pay Telkom twice in any of the month and its time consuming as Iwould like to keep my original number. I app**** for the NEW contract, got parcel on the 11th May 18. The same day Telkom Capetown(upgrade department) ********** 110, called me that my mobile number is due for an upgrade & I can upgrade to the deal of the month. I was very confused even today as Telkom refused for me to take an upgrade earlier. Currently, I have the deal of the month still sealed(not opened) in original package. I don't want a new contract but I would to upgrade as Capetown Upgrade department suggested so. Please help urgently.