Warranty claim dispute

On 5th October 2015, I booked in my Chevrolet sedan at the Thorp Plumstead Dealership to check an engine noise. I was informed a few days later that the repairs would take a month because the engine had failed a compressor test. Afterwards, I was shocked to hear that foreign metals was found in the engine. Their automotive engineering service provider claimed that the engine cylinder head was previously skimmed. <br> In November 2015, the service manager Mr R Britz informed me that GM had send their district managers, Mr R English and Mr J Taylor to inspect the damaged engine and it was decided that GM would not replace the engine under the manufacturers warranty.<br> Further investigation revealed that Reeds N1 City had previously done engine repairs during a routine service interval and decided not to claim from the manufacturers warranty. On the 26th November 2015, I received a mail from the Thorp dealership that the service manager, Mr J Smal of Reeds had decided to collect my vehicle at Thorp but gave no indication how my complaint would be remedied.<br> I am most unhappy in the manner my complaint is being dealt with and I insist a GM representative to review and oversee my complaint.