ABSOLUTELY WORST SERVICE EVER!!!

I have three vehicles standing at Mahindra Silverton - all three Mahindra Xylo's. Two of the vehicles have been standing there for months and months. They do not do anything and then eventually they phone and say come and fetch the vehicle. You literally drive 2 blocks and have to return since the vehicle is not fixed yet!! Then the whole waiting process starts all over again - months and months. What on earth must one do to get some help from Mahindra. I have also sent emails to Mahindra South Africa and no reply!!! Give me the CEO's details - I will make an appointment to see him. I have never in my life experiences such bad, bad really bad service!!! It is an absolute disgrace. My company can not work - people are sitting and doing nothing since I do not have vehicles - and I am losing thousands every day. Whatever you do - do NOT EVER buy a Mahindra