Harassment over cancelled contract

Just got a call from the rudest consultant ever!! My contact ended in Nov 2019. I then called to cancel, I asked the agent if Dec19 will be debited and confidently said no. Later on I decided to register my new vehicle again with them, I called and opened a new contract thereafter the agent transferred me to booking center of which I had to hold forever. I hanged up and decided to call a nearest center myself since it’s December time and I needed the vehicle fitted. The fitment appointment was done through the other center. I waited for technician to come fit the car as per arrangement but no one came. Today I get a called saying I owe 109 which is the previous installment and the new one was higher I remember correctly. That person said the debit is against a Renault Clio of which I have never owned in my life. When I wanted to get clarity on the vehicle she insisted I stop talking and listen to her, we had a back and forth arguing due to her tone where she wanted to confirm ID. My question to net star what do I owe?