In respect of the (a) 2007-08, (b) 2008-09, (c) 2009-10 financial years and (d) period from 1 April 2010 up to the latest specified date for which information is available, (i) what is the total amount of debt the municipalities of (aa) Mangaung and (bb) Matjhabeng have declared to be unrecoverable, (ii) what percentage of the unrecoverable debt was owed to these municipalities by consumers, (iii) what was the total amount of unrecoverable consumer debt and (iv) what was the percentage increase or decrease of the unrecoverable consumer debt?