Mis-management by Trustee

Hi, I filed a chapter 13 five years ago and all of my payments were payroll deducted. There was a 6 month period in 2007 that I was disabled and not able to make my payments. A motion was entered to allow the 6 months and to increase my monthly amount for the remainder of the plan to cover the missing payments. Now that it is time for my plan is to discharge it has been discovered that the trustee did not file the increase with my employer till two months ago. This will now add three months onto my plan. I am quite upset, I pay them fees to manage my plan and they did not do their job. Do I have any rights regarding their error?

Thank you in advance for your help with this.

Tammy