billed whereas I have a maintenance plan

I am very disappointed by the response I received from the service department at hyundai Bethlehem this morning. I took my car for the 60 000 km service at hyundai Menlyn, and the lady that assisted me was kind enough to inform me that I also have a maintenance plan that covers brake pads just from uploading my car details on their system. So I told her I had my brake pads replaced when my car went for the 45 000 km service at bethlehem hyundai and I paid R1200 for that. She told me that I was not supposed to have paid anything, so I decided to call bethlehem to confirm this and it was true and it is recorded on the job card, but I am being told by hyundai bethlehem I can't claim that R1200 because management has changed and its 7 months later. This is just unacceptable, if Menlyn could pick up from their system that I have a maintenance plan why didn't bethlehem do the same, its the same company, same system just different provinces unless all hyundai's in RSA work differently. 7 months later is not a factor, the point is I paid whereas I have been paying for the maintenance plan to cover such things. So please can I just get my money back and not be told stories