nissan dealer cant service my datsun go

i have 5 new datsuns 1.2 lux and the 1ste 1 must go for its 1st service(15000km) but Nissan in wonderboom say they cant service my Datsun they don't have the approval to service a plain old 1.2 3 cylinder vehicle,my business is in Pretoria-north and they say I must take vehicle to Nissan silverton but that is very far from me but there is a Nissan dealer just around the corner from me,my vehicles are being used every day and I cant afford a vehicle to stand as I lose money ,now i am forced to take vehicle 25+km away for servicing but there is a non approved dealer(Nissan wonderboom) just 5km from me<br> <br> I have 5 datsuns and wil soon be buying another 2 but if a knew what I know now I would off bought Toyota's as I can service them at any dealer,i need feedback as to why a customer needs to have this problem regarding the servicing of his vehicle's witch is under warranty and I bought a motorplan with all my Datsun's<br> <br> its plain datsun's not a Nissan gtr to be serviced