False information provided

I phoned Kia Motors Roodepoort to confirm when the motor must go in for service as the motor plan is expiring. <br> I provided the person in the workshop the vin number and the registration number. The person confirmed on the phone I must take the motor in before 12 September 2015. Also last year they also informed we have on more service left. So I took the motor in for the service on the 11 September 2015. When I collected the motor I received a invoice. When I asked what about the motor plan suddenly they said the plan has expired. I ask the workshop manager to look into this he just refused to help. He just said none of his personal will provide me with incorrect information. It didn't' even help trying to speak to him as the manager just kept on blaming me said I didn't know what is happening with the motor plan. I had to pay the service at the end as the manager was not help full at all. Is this the new method getting client to service there motors with incorrect information.