Incomplete job done on my car and bad after service

My car had been taken in to get repaired, after two weeks of being there it was returned to me with the bumper not fitted correctly into the brackets. I was told that an arrangement would be made to have my car collected so that the bumper can be fitted correctly- because I refuse to drive up and done and be inconvenienced for work that was not done correctly! Finally just over two weeks my car was collected and returned to me in less than 2 hours. The drivers gave me my car key and drove off because they had to get to PTA. The people must really think I am stupid that I would not notice that all they did was push my bumper on instead of fitting it correctly into the brackets! I am appalled by this work ethic and after numerous attempts to be put through to the service manager Bianca,I was told that she had been in the boardroom all day and to this hour,she has not made a single attempt to contact me. What’s ironic is that from the time in which I had taken the car in for an assessment leading up to my insurance approving it,they were calling me non stop to follow up,now that they have done a poor job on repairing my car,calling me back is too much too ask for.