I got a kogan Mobile SIM during the $5 promotion and didn't know that kogan has default settings to automatically recharge mobile plan at the end of each bill circle so after I throw out the SIM card I got an invoice email telling me that the plan is automatically recharged….
I know it may sounds a silly but Can I ask a refund?
They certainly don't have to but you can ask. But you can cancel the service so you won't be charged further.