Deceptive and ********* selling

I took 2 contracts with mtn and it ended in September 2023.I had an 80g data package on one sim card and 500mb plus R65 airtime on another sim card.When it ended i was called by one of the agents and she mentioned that she will upgrade my data from 80g to 120g which will cost R179.i agreed,October they gave me 30g not 120g as she mentioned.On another sim card they loaded R200 airtime and 2g and i was not told abt it.I contacted mtn via messenger facebook i was told its 30g not 120g.I asked to go back to 80g i was told i cant until contract ends in 2026 September.I want them to change my package back to 80g or cancel contract as i was deceived.I would not have agreed to a downgrade from 80g to 30g if she was honest with me.I only agreed because she said 120g.30g is not enough 4 me and for the other sim card i don't know how was it converted from 500m plus R65 airtime to 2g plus R200 airtime i was not told about it.I want my to contract to go back to how they were before or to be canceled both and im not going to pay for anything as i was told i have to pay if im canceling.I wouldn't continue with contract if i was not deceived.my sim cards are *** and ***