lost patience

I own a audi A3 1.8 TSFI which I bought this year it has 14000kms and having endless problems at 5000kms experienced noisey gear changing it went in for 1st repair 2 days later noise back and car stalls went back for 2nd repair afta fews days noise back vehicles been with umhlanga audi for a month and was told its normal noises .My question and arugement is the day I bought the car and drove out the showroom there was no noises up till 5000kms no cutting out until they repaired the gearbox .My cars under warranty and the dealers giving me stories as it could be this and that I'm totaly frustrated cause the car was with them 4 weeks nothing was done vehicle has the same problem.