Promised 24 months contract with new handset, airtime and data and later changed to 36 months no data without informing me

On the 15th of September 2023 I received a call from Vodacom offering me a contract upgrade. I already had a 20g discounted data with vodacom. The agent who assisted me said I qualify to received a new handset that comes with 200 airtime for 24 months contract..

I explained to the urgent that since I was receiving the 20g data, if it will fall away when I do the upgrade, I will not accept the upgrade. She assured me that I will continue to received the 20g, plus 200 airtime and new dual sim handset. I later received an email from Vodacom on the 4th of October 2023 indicating that I have signed up for 36 month contract where I will be getting only new handset and 200 airtime.

I called Vodacom on the 6th of November 2023 and I was referred to enquiries and complaints. They promised to listen to the recording between myself and the urgent. Vodacom never bothered to give me feedback of their investigations. I called them and they promised me that someone will call me and no one called me. Today, 11 December 2023 I called vodacom again and I was told that the outcome of their investigation proved that I was telling the truth and that means I was not offered what was promised. Now vodacom can only reinstate the pro-rata data and they cannot change the contract from 36 months to 24 months. The other option is for them to collect the handset and cancel the contract.

What I want from vodacom is what was promised/agreed between me and the urgent which is the new handset,200 airtime and 20g data for 24 months.

Please be careful when signing contract with Vodacom, what was offered is not what you get.