Contract dispute

Here it goes. I have a contract with Vodacom from which i had initially signed to pay R826 for 5GB and R230 monthyl airtime including the Samsung S10 handset that i recieved in may 2919.

6 months later, a Vodacom agent called me on the 15th of November called me to reveiw my contract. The lady i spoke to offered me 2 more GB and 150 minutes instead of the airtime for R455 instead of the initial R856

I asked the lady 5 times to ensure that i was clear about what she was offering me

I have called Vodacom to ask for a recorded call because i have now recieved an invoice saying that i will be paying R1 105 monthly

Obviously this lady mislead me and i an not happy about that

Vodacom keeps sending from pillar to post they are not giving me a way forward