Rusting Mahindra

I have bought a new Mahindra double cab S10 at the Auto City Heidelberg branch 2 month a go. After I got the vehicle I decided to remove the roll bar an cover from the rear bin. On witch I noticed paint is starting to make bubbles, holes where Mahindra have drilled still have burs on from the drilling. The holes is now starting to rust an they are claiming it is because I have removed the coating to prevent the rust. As soon as I removed the roll bar and I noticed the problem I called the sales person Pieter du Bruyn and drove to Auto City to show him what is going on. Now apparently Mahindra is only willing to contribute R2000 to get the problem fixed because the are rejecting the warranty.