Faulty used car

I purchased a used car in March, all seemed well as minor issues that I noted at the moment promises were made by the salesman that they will be fixed. Little did I know that the cracked Grill was actually an indication of a much bigger issue a faulty front bumper. My boyfriend and I called the garage, an arrangement was made for the assessment, at first there denials and eventually they acknowledged it. It went in to be fixed only for it to come back with poor workmanship and even more problems. Reported it, they have been mum for some time. One day we were driving from home, the bumper fell off the road, Jesus Christ revealing all the ****ty work than was done which is nowhere close to fixing the problem. The matter was reported again, now they are giving me the run around which is infuriating. You will be shocked the horrors we discovered when the bumper fell yeses! Yhooo I regret the day I made the deal with them.