CMH MAZDA

I have bought a vehicle from CMH MAZDA RANDBURG in April and have had several issues since then. Vehicle has been going back and forth since then and still not sorted out. (In the time I bought the vehicle it has been with them for 2 months, meaning I have only had the vehicle for 2 months since) Manager just saying it is a second hand vehicle. Again not even 2 months or 1500km later the vehicle keeps losing power and shows enige service now on display (problem not resolved if it keeps coming up) I need this resolved.