MB refuses to repair the bearing since it likely does not appear as an individual component on their Electronic Parts Catalogue (EPC). MB dealers are technicians, not mechanics. They prioritise intuition above intellect. I find it unlikely that they would engage in the meticulous task of using a bearing puller and press, unlike a mechanic.
Acquire the springs from MB.
After removing the hub and bearing, your technician will proceed to replace the bearing with a new one. There are several locations that provide bearings. Ensure that he does not get an inexpensive one. FAG is a leading company.