I bought a used Mazda MX5 three months ago from a dealer. The car had just 65 miles on clock and was just a couple of months old. The franchised dealer told me it was a former demo car. Since then it has had three new batteries and has just failed again.

The dealer has investigated a possible battery drain for a total of five weeks so far, concluding a faulty battery. Now it has failed again even they agree there is a drain on the battery but their diagnostics are not pinpointing anything. I need this car for daily use and am desperate to resolve it, but have put the manager on notice that it is not fit for purpose, what are chances of getting our money back and how big are the hoops to jump through likely to be?