Trash cartrack

Took a contract with car track in 2017. The agreement was for them to deduct the premium on the 15th of every month which is my pay date. Somewhere somehow they changed it to the 25th and I dont have money in my account on the 25th. The debit order will bounce and its costing me a lot of money because fnb is charging me R120 for a bounced debit order and I have been telling the agents at car track that they should change the debit order date and they dont want listen. I'm not sure if it's their system that doesn't want to listen or it's the people they employ. A few minutes ago another agent called me and I asked to speak to their supervisor and she hung up.

Please help.