NTO dated 5 Jan, therefore presumed served on 7th, 28-day period ends 3 Feb. If you made reps electronically on 2 Feb. then these were in time.
Next stage is to wait for the Order for Recovery at which point you make a submission that you made representations to the authority but did not receive a response. Send this as directed on the form, the CC and OfR will be cancelled and the matter referred to the adjudicator.
Keep the reps you submitted and the auto receipt, you're likely to need them.
Otherwise, it's a case of waiting for 2 weeks and then checking the council website periodically.