The A330 were sold in 2012/3 to the Guggenheim group (partners or investment...). This is the organisation which also owns the guggenheim museums.
Monarch was leasing them back for 5 years...until 2018.
Did they manage to get out of the contract? I don't know but it was not in the plan to use these planes after April 2015. Monarch announced it has gone out of long haul.