changing my contract- not what i signed for

I took out a 36 month uncapped contract, when i login to my vodacom app its shows 500G+, i called the randburg contact center spoke to Dineo M, she advised nothing she can do, apparently according to her i never take out a uncapped contact, even thou on my mobile app and vodacom app it showed it was uncapped.. she said i will need to change my contract or cancel it.. (NICE SERVICE) ...this was after she spoke to her TL Tebogo who refused to talk to me... she also was unable to give me his surname... i wonder why... THIS IS NOT WHAT I SIGNED FOR AND THIS IS NOT WHAT IS SHOWN ON MY CONTRACT... by the looks of things i dont think this will be sorted out (Can anyone who read this provide any legal advise)