Dishonest and terrible service from this place

I bought a car from them the 06 December 2018, since day one have had an oil leak, radio not working engine makes a noise, car has no power etc etc, many faulty things, i have informed the people involved and empty promises, they times refuse to answer my calls, i have had the car for over a little as a month and i requeated a full refund on the car plus money spent on new tyres i had to put in , they are refusing to fix the car and refusihg to give me my money back ! Terrible dishonest people, i urge anyone who has has the same problem by then to come forward