It's unlikely that there will be a hearing. A Judge is likely to deal with the matter on paper which means that a decision will be made once your reply is considered.
The petitioner has already made their statement (the petition and the claim for costs) and all is needed is your reply. There is no need for the petitioner to respond again.
Different courts have their own procedures and different judges also have their own procedures so it's very difficult to predict what might happen. The only thing that is certain is that the petitioner will obtain a costs order if you do not respond.