Many management people are not aware of changes in patent law that allow triple damages. A company is legally responsible for knowing about current patents, either granted or pending. Ignorance is not an acceptable excuse. They can be forced to pay up to triple damages and your attorney fees under certain conditions. Punitive damages are usually awarded for willful infringement.
Juries tend to take a dim view of companies stealing from individual inventors.
They are especially sympathetic when the company is large or foreign owned. If polite persuasion didn't work it does not hurt to play hardball. It is very important that you understand both your and your adversaries strengths and weaknesses before you get into an all out war. Gather as much information on an infringing company as possible before notifying them because they will take measures to block your acquisition of information as soon as they realize you are a serious threat. Contact past employees.