Cartrack poor service

I joined car tracker in September 2024 and I was informed that if I pay for a full year I'll get a discount, on the 19/09/2024 I deposited money into their account. I have been getting calls, emails, messages and WhatsApp messages from September stating that my debit order has not been paid and today they debited money from my account, I have been making calls and sending emails to the accounts department and they've been promising me that they will sort it out and I have even sent proof of payment to almost everyone at their accounts department. Please assist as I am not getting any joy, I am a unhappy customer.