My car has been in for repairs every month

I bought the car at jeep Constancia in 2014 December, I first complained that the vehicle looses power every time it drives up hill, I was given some paper that states all jeep srt8 do that when going up hill, I let it go, a week later the front left wheel started making noise, I took it there, and they said the suspension was loose and they have fixed it, 2weeks later it still makes a knocking noise, they fixed it again, I putting new tyres on the car, now they say it's not the suspension it's the tyres, then the car kept switching on the engine light , they kept sorting it out and it would go back on after a few days, they finally sorted out the engine light, but they keep saying the front left is the tyres even though it started before I put on new tyres. Now the car has been sitting there for more than a week and a half as it does not wont read the key, they are waiting on head office to authorize the key, I feel as if I was sold a faulty car, they can't even give me a courtesy car