First time buyer ******* to buying a car he didnt want initially

First time car buyer. Bought a car online and what i received was different from what was agreed up on. The sales people ******* me into signing the contract without reading it first since it was late and i was in a hurry too, they also insisted that they needed to send out the agreement immediately so the bank could approve and release the funds. They said they will send me a copy of the agreement before i pickup the car but they never did. I Only found out when i had to pick it up the car that i signed and had agreed to the car i didnt order. I told them that this is not the car i wanted and they brought up legal terminology which i did not understand. i took the car afraid that i will have to pay for something i dont have but i have not been happy with it since. This is the Audi center in Braamfontein.