Poor service at Liquid Capital

I have been battling with Liquid Capital for at least a week and a have now and have been driving around with a vehicle that is overdue for service. I signed up for a service plan almost a year ago and only found out when I needed to take the vehicle for service that they had loaded the plan on an older vehicle I no longer own. This was a mistake on their side as I had given them the correct vehicle details. They are now avoiding owning up to the mistake and paying for service as I have been paying a premium they quoted me on. What they would rather do is pay me back all monies received from me, then I can sort out my own service and even be liable for the difference in amount for the service. I find their resolution very unfair, disregarding and inconveniencing to me as a customer. I have also asked for the call recording on a number of occasions so I can use it in lodging the complain with the ombudsman, but this has been to no avail.