reversing and ive just damaged my new rear bumper AGAIN !!!

the flaps catch under the wheel when i went up a raised curb parking and pulled it down, snapped the bolt hole off and another bumper is fooked

NOW apart from ripping them off and placing the stupid mudflaps in the bin im thinking of fitting bonnet pins to attach the rear bumper in place,,,,, anyone else done it before ???

BOY i hate cars sometimes !!!