Chainsaws

I have a Poulan Pro PP4218AVX that failed. I took it to an authorized Poulan service center, they phoned in the diagnosis, and Poulan denied the warranty claim. I called in to Poulan customer service and they refuse to connect me to anyone who can address this issue. I took good care of my chainsaw and will not just accept that it's my fault that the chainsaw failed. . And the runaround on this is maddening. If the warranty is denied, there should be some way to dispute that determination.

Who do I contact to address this denied warranty claim?