Projection lamp replacement

Question

My televsion recently indicated lamp failure was imminent so I checked the web for replace lamp prices. Contacted local authorized repair facility, obtained the lamp for just under $300. As instructed I replaced lamp buy the tv still did not work so they took it into the shop an now tell me that the lamp failed again an there was another part out an they did not recommend repair. I asked for a refund of the lamp since the all the web companys list 180 day replacement policys but I was told that is not the policy of this repair facility so I contacted Zenith an they also affirmed that it was not customary to refund for these lamps. Am I being unreasonable to expect a refund? I am now out $300. an have no television. This tv was exactly 3 years old when this occurred.