Dishonest ****mers.

I bought a car 2 weeks back,the salesman told me when i was buying that they gonna need me to top up the money with 5000 for admin fee...i told him its ohk they can add that 5000 on the invoice. Only to realise later that they actually charged me 11.200 instead of the 5000. I communicated with the salesman and he was just telling me stories which didn't make sense to me.He then told the other guy (salesman's man also i guess) to call me and convince me which till now i don't really understand their story,the other guy told me that i must bring the car back but ill be charged penalties,which dnt really make sense to me.I want my money back please Thapelo and bidvest silver oaks,I don't have a problem i can bring the car back but i want every single cent i paid.its not my fault that you were dishonest and i cant pay for your dishonesty.