Bad service (Kia Fourways)

I bought a new Kia Picanto in last year December, last week Friday my indicators stopped working I took it in to them they said I must bring it Monday for a full diognosis I was told it’s sorted the took a part from a new Picanto and replaced it with mine (which made me wonder did they not do the samething with my car) when I got it the car the indicators are still not working I was told they will get a new part on Wednesday I asked I must drive 3 days without indicators which is not safe for me or other drivers I was told unfortunately yes. And they say they are a prestige deal which I doubt at this point I really disappointed at their service.