Faulty bikes on Cayenneworld

On buying a Motorcycle BMW K13 at Cayenneworld the21/11/2015 the dealer said he just got to do a PD service on bike. Just for me to find out nearly three weeks later that the bike has got a diff problem and the dealer is waiting for feedback from BMW I am very dissapointed in Cayenneworld service because I already paid for the bike and they Advertise in Bike SA walk in ride out bikes on showrooms now it look like they selling faulty bikes and gives a 2 year warranty on it come on . Please Help!!!!!