FlyerTalk Evangelist
Join Date: Aug 2011
Location: Barcelona, London, on a plane
Programs: BA Silver, TK E+, AA PP, Hyatt Globalist, Marriott LT Plat, Hilton Diamond
Posts: 13,033
You cannot "force" Vueling to reroute you on another carrier, especially more than 14 days in advance.
All you can do is make your own arrangements, and then take Vueling to court later for reimbursement of the difference between what you originally paid and what you ultimately paid. You may or may not be successful, with the risk of subsequently having to pay any court costs if you lose.