Not informed my new car in accident

I bought my car new at Hyundai Bedfordview five years ago. I had a slight fender bender on my door and my insurance got an approved BMW panel beater to work on my car, i had a scratch on my bumper and asked them to quote me on that as well. I was horrified to find out from two panelbeaters that there has been bad workmanship done on my bumper. The thing is there has been no work done on the bumper i bought it brand new like that. <br> I have since then asked Befordview branch to look into the history of the car as they have to have a paper trail of the work they had done on my new car. I booked my car in yesterday and was told this morning that they will not be fixing my bumper because i am 2 months out my guarantee.<br> Well I did let Hyundai Eastrand know when i did my service 3 years ago and was told that there will be a difference because the bumper is a different material from the rest of the car. Hyundai should have informed me that there was work was done on my new car then i could have taken it to a p/beater immediately to evaluate the work but they sold me a car with bad workmanship.<br> Customer service should have been able to assist me even though i was upset but he was so rude.