Horrible service

I took a vodacom 36 months contract on 16 august 2024. During the call I was told that i will receive 25gb anytime data & 10gb night data. To my surprise, only 15gb anytime data was loaded and 10gb video data which i never agreed to. On the 6th of september, i called the customer care to get clarity and they advised that I only receive 15gb anytime data. I then informed the agent to cancel my contract & that i do not wanna be liable for any charges. To date, nothing has been done!!! Can this be cancelled asap