Hi mate I had all mine changed with no problems. If it looks different from the other side and tyre is wearing uneven then something not right I would go back to garage and tell them your not happy. I would also tell them you want a refund of labour cost because if they messed it up first time you don't want them dismantling the back end if your car again . If you paid on a credit card also speak to them they can sometimes refund payments if things are not right