Is this a violation of the automatic stay?

We filed Chapter 13 in Sept. of 2012 which was granted with a payment schedule beginning in Oct. We are current on payments to the trustee. The lender's trustee continues to list our house for auction every month as a foreclosure sale on auction.com. Which creates numerous problems, specifically realtors and buyers on our property. We have asked the lender and trustee to stop numerous times. The lender won't even respond and the trustee finally answered and said no. Each month they list the house for sale, without notification to us, and then postpone and list again the next month. Any recourse?