You are not likely to get an answer from VM on this forum as they don't usually reply here. I don't think VM will do this for you. AIUI, it is new account gets a new router.
Personally, I would not recommend that you try to get the old router from the previous owner reconnected anyway.
Assuming it is a current model, VM will charge the previous owner for its loss and the router will be linked to that past account. You will then be linking an old router from a past account to your current account at a common address for the two accounts.
Given VM's general incompetence at anything that falls outside their normal processes and procedures, I'd suggest that you would be opening up the possibility of a load of VM administrative chaos (not least of which would be if the previous owner tries to reclaim the original router to return it)!
Your contract should not start until your service is activated and running. Have VM advised why they cannot supply a router until Feb? That sounds ridiculous.
