Disappointed customer

I am very disappointed in penta and the service that we are receiving. I was sent a email to say that we need to make a booking for the service of my car which I did and then it was confirmed in two emails from the booking department. When I arrived on the date they told me I have to pay for the service because it was too early. I had to wake and get ready my 16month old so we could be there by 7:35 and I drove all the way just to get told sorry but you will have to pay! I took the service plan for a reason. Could no one see its too soon and tell me when I made the booking and why send the email saying I need to make a booking now. Put a date in and say it needs to be done before this date. I've been with suzuki for a long time this is my 2nd car and this has been the worst service I have ever received. Now in 2 weeks time I have to do it again. Don't understand why they could not just help since it was not my fault.