MG Sandton sucks!!

I bought a secondhand vehicle from MG Sandton for which I paid cash after an agreement was reached with the Dealer Principal. After the money was transferred into their account the Dealer Principal decided to change his mind on what was agreed the previous day and went against his word. He refused to give the normal 6-month Dealership guarantee on the purchased vehicle as per our agreement the previous day which is also a legal requirement on secondhand vehicles. I will never consider doing business with these people again.