Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Poor service Bowflex Series 7 Treadmill

I purchased the Bowflex Series 7 Treadmill 11/06 and it was great. However, in Mar. 2007 the rear roller became noisy. I contacted the company and they immediately shipped a "front" roller by mistake. The technician could not find anything wrong so he did nothing.The rear roller noise became extremely loud and we've contacted the company. They initially said they would ship a rear roller but now they cannot give any date at all.We're not pleased with the service. We need the treadmill for walking. My husband Jim had a stroke 2 years ago and he was walking 4 miles per day outside then on the treadmill but he cannot use it now.