Who do you contact if the DELL India Escalation and Support Team fails to provide support for brand new Laptops

We are Dell resellers and had placed an order for 43 Laptops - Dell Latitude 3560 with Dell on 13th June, 2016. We delivered them to our customer on Friday 17th June, 2016. On Monday 20th June we discovered that all the Laptops are faulty and are not functioning properly. They have not been able to use a single system due to touchpad issues in the entire lot

We have made innumerable calls Dell to resolve the problem, but the team is unable to identify and rectify the problem. 

We have spoken to our partner account manager, regional account manager, Service Specialist and Escalation Team, requesting them to provide us with a solution at the earliest as their work is getting hampered. Our customer has to deploy the same by 1st July however they do not have any Dell Laptops functioning correctly.  

How do we escalate this to the Dell management and get a replacement ASAP

Regards