88 year old customer not attended to for 2 months

My Grand Dads Car is Problematic and Mercedes does not want to give assurance of the vehicle been fixed completely and that problems will not persist.<br> <br> Support acknowledged receipt of complaint and fails to follow up even after my requests for them to respond!<br> Mercedes should take the car back - The premium paid for the brand was a waste of money for this kind of service on a product and support level! <br> <br> 2 months and 2 weeks later. still no feedback!