In respect of road works in KwaZulu-Natal in the 2020-21 financial year, what (a) total number of contractors received contracts from (i) the SA National Roads Agency and (ii) his department, (b) are the names of the specified contractors, (c) are the relevant details of the work that each contract entailed, (d) are the roads on which the work took place and (e) is the date of completion for each contract?