Car worse off than before

I took my honda civic to Honda Melrose arch on 17th February 2015 for brakes. The front brakes required a change. When they assessed my car I was informed that the front and back required changing but to my knowledge and when I checked, the back brakes are okay and just the front brakes required a change. the front and back brake pads were changed yet the brake discs were not changed because I was told that it was fine. From the time I was informed of the costs of the repair to the time that I received a call to say my car was ready was under 45 minutes. Is that possible? Did they do a thorough check and a proper job on my car?When I arrived to collect my car the amount stated on the invoice was way more than the amount that was quoted to me initially. Daniella Ohlsson was certain that that was the correct amount until I assessed the invoice to realise that a service was charged to which I did not agree or authorise. Daniella then went to the workshop to speak to the foreman and the mechanic and I heard shouting. Suddenly the foreman came upstairs with a part in my hand and took my keys. Daniella returned and did not provide me with feedback until I requested. Car is worse off. TBC