Cyril,
Sorry to hear about your support experience. I would like to help and get your issues resolved for you. As well I am also sending you an email so that you can use me as a point of contact for help.
If you would, could you send me a reply to the email with your svc tag of the server and order number for the new dimms. This is so I know what you have installed currently and what dimm is trying to be installed.
When you install the new dimms are you receiving any error or message referring to the memory not being optimal?