Telkom Negligence and cruelty

I called in to Telkom a few months ago for a mobile data contract for 40 gig day/40 gig night (that comes with a router) . When the package arrived, i called to activate the sim, but was told that they had sent 20/20 instead. On the call (that i assume was recorded) i said multiple times that i wanted 40/40. I subsequently called, days in a row for a few weeks bad was told to wait for managers (who never called back no matter how often i called). Eventually,i called again and was told that the only way to be assisted was for me to pay the entire 24month cost (for a product i didnt consent to) and start again. I refused, and complained twice on facebook where i was told by 3 different consultants that my case was escalated. Every month a debit goes off, which i have to reverse cos i have never used that product, and its messing up my credit profile. Im young, and still have to buy a house and car and i think its messed up that Telkom's negligence is going to destroy my future ability to obtain credit, when this isnt even my fault. This is so unfair.