I am waiting for a call back - waited 25mins on tel line to no avail

Received today They have listed the 3 years with a total of £318.29 + £60 charges Surely they would have brought these to light before the later summons??

No Same address same reference account - thats why I thought that it would have been included in the first summons!!

After receiving summons for non paid council tax and subsequent bailliffs visits (payment plan arranged) I have today received a summons for £318.29 plus £60 charges. This is for years 01 apr 2004 thru to 31 mar 2007!! Surely this would have been amalgamated in the previous most up to date summons?? Tried calling council but have had to leave my details for someone to call me back/ignore me completely in the next 24 hrs!! Why haven't they given me any other notifications - just gone to court? Is this right? legal?