As it is now well over the 56 days, it is worth contacting the council to enquire of progress on considering your representations. You need to be cautious, because they may have responded but the letter is lost in the post, now an unfortunate fact of life with the privatisation of Royal Mail. Unfortunately, government assumptions in regulations for 1st Class post are up against current reality.
Of course, if they have not responded, you win by default. In fact they may have decided not to bother with any representations as the money coming in means they can ignore them.