Pay back my money

When i bought the car in 2012 I was told it comes with a 3 year service plan and that the next service will be in 2013 around the date I bought the car. In 2013 when i took the car in for service i was told the service plan lapsed because the car was not serviced the year before. I then went back to the dealership and the then manager and the consultant who sold me the car agreed hey will pay for my service for the 3 years to make up for the lapsed service. Now that the manager and the consultant have left the dealership its my problem to phone them and get them to call the new manager to corroborate my story because we don't have anything in writing. After sending a million e-mails and making a million and one phone calls to the company, I am still without a refund. This after I had to explain myself with every phone call and e-mail. Charlene keeps telling me she will call me after 5 minutes because she is waiting for her manager to respond. All I want is my money.