Unhappy Chevrolet owner - still no feedback

Dear Chevrolet,<br> This is your (Chevrolet`s) commitment on all of your websites / pages and adverti*****t:<br> At Chevrolet we are driven towards innovation. Towards finding new ways to make your Chevrolet experience even more rewarding. It's what inspires us to create vehicles that are exciting to drive and equally exciting to look at. It's what pushes us beyond the ordinary, towards the extraordinary. To produce world-class, reliable, affordable innovative South African vehicles. Wherever you want to go, let the Chevrolet value commitment make it happen. However, I cannot relate to this and as a customer, I can also not agree.<br> My Chevy Aveo`s head gasket blew on the 30/06/2015. Since then we have been struggling to have the vehicle fixed. We are struggling because of parts that seems to be a ''special spec''. It's been almost two months now that my Chevy Aveo is standing due to VALVE GUIDES that cannot be provided by GM? The engineer kept the samples of the valve guides that was taken from the head = 5.9 mm, but all we can get as far as GM warehouse in cape town is 5.5 mm ? If it comes standard from the head, it should be supp**** as standard items, isn't it?