Update on the water leak

After taking the car in for its service, they found the water leak problem that this dealership failed to find or just ignored everytime... The radiator is leaking and need to be replaced. For a radiator to look this bad, it has been leaking for a long time... How did they not see this in the numerous times we gave them the opportunity to fix the car?? And again, how did they get a roadworthy certificate? They can't be trusted... Be careful when buying from this dealership...