Re-apps rarely get approved.
(SS - not sure how you might approach this in your part of the world, but sometimes, and only rarely, intervention by our US Senator has helped - RARELY.)
SPL - In my experience sponsoring usually will not work in a short term situation like a vacation. Those usually only succeed in cases where the individual is bringing in some talent or skill of benefit to the sponsor and his organization - OR in special cases, relieving the sponsored individual of severe economic or political difficulty. Is this the case? A quick phone call to a lawyer in your area who specializes in Immigration issues might be fruitful - or not.
It's a different world in which we now live.