I was unfairly misled by one of sales consultants at the dealership by the name of Thabo Donald Mmoledi about the contract i signed on the 1st of June 2021, he told that i will get 10

I was unfairly misled by one of sales consultants at the dealership by the name of Thabo Donald Mmoledi about the contract i signed on the 1st of June 2021, he told that i will get 10.1% fixed interest rate for 2018 polo tsi 1.0 trendline with monthly installment of R3800 for 72 months but all of above mentioned was totally a lie, i got a contract that is 12.8% linked interest rate with R4400 monthly installment for 84 months, i tried to explain everything to his manager by he didn't wanna listen to me and he said there is nothing he can do about that about few days after signing the contract and he refused to change the contract or to cancel the deal Now the sales consultant said he is delivering the number plates together with license disc but he texted me saying he needs me to sign some documents, i told him i won't sign anything again that i don't understand, he said i should come to collect those number plates since i can't sign his documents and he said i think I'm special Can someone help me with the whole situation, I'm not happy at all with the whole deal and can they take their car back since they can't fix my contract