Are you in an extension year for equity, or was the IVA set at 6 years from the start ? If you are in your equity year they should not be able to unless there was a minimum dividend to be met ( rare these days).
If you were in a 6 year term from the start, it could be extended by a further year in lieu of equity, if you are a homeowner with more than £5k equity.
My opinions are merely that .. opinions based on experience. Always seek professional advice.
IVA Completed 23rd July 2013 .... C.C. 10th January 2014
Sharing from experiences of dealing with debt
The greatness of a man is not in how much wealth he acquires, but in his integrity and his ability to affect those around him positively.
Bob Marley. http://kallis3.blogs.iva.co.uk