General Motors remains that, GENERAL

I have a 2014 open corsa essentia sitting at almost 40000km and today, I am having to replace brake pads and skim the disks after 18000km, for the second time in barely one year! The first was on feb/march and in june when the car went into fury sandton for the 30000km service I advised them of the funny noises whenever I apply my brakes and they confirmed all was in order. Today John at Tommy Martin(service manager) says wear and tear parts have no warranty and yet according to GM's warranty manual on GM's website it states that \all original and fitted GM parts have a nationwide unlimited 1 year warranty"what does this relate to? I cannot afford to be spending R3000 twice a year on your \""original\"" parts. This is my second corsa and never did I experience such to this day! I find absolutely appalling that the manual on your website (GM) says one thing and your staff say & know something else. I was advised to call your customer service call centre and \""maybe\"" you might assist in this regard"