Service plan information.

Recently bought pre-owned vehicle in june. With the information that was shared with me i still have benefits on the car. My issue is that the car is due to be serviced and i have been trying to contact the company to reinstate the service plan. They keep taking my details. Everytime its the same pattern. And eventually the fone is dropped while i wait for F & I department. And no one gets back to me. I dont know what to do anymore it has been a while month now of trying to reach only 1 person who can help me.