Join Date: Aug 2011
Location: Barcelona, London, on a plane
Programs: IB+ Gold, TK E+, Hyatt Globalist, Marriott LTP, IHG Diamond
Posts: 14,182
You must deal with the OTA and hope that VS has a published policy allowing refunds for such a significant schedule change. Otherwise you are stuck on the new flight.
P.S. You are now finding out the serious downside of booking via an OTA (with little to no upside)