Chainsaws

I purchased my Poulan Pro Chainsaw in March of 2014, I used it once. The second time I used it I noticed that the small piece of metal that adjusts the chain had broke. Is this part covered by the warranty? I don't understand how it broke or why, but I cannot return the product and I spent $200.00 on chainsaw that only worked once, I am very upset. Please let me know if there is anything that can be done to rectify this problem?