BA Comair vitality Emirates booking fiasco

We booked and paid months ago for a group of 3 of us traveling together to Athens via Dubai an emirates flight but booked through the BA Comair vitality facility. We also booked and paid for a connecting flight to Santorini out of Athens based on confirmed BA Comair emirates details. Now we are told 5 days ago that emirates have moved a flight out of jhb and we are split up on different flights one with an extra 10 hour delay in Dubai and the third person on another flight even that is 24 hours earlier with a further 10 hr delay. This is NOT a workable solution. We are constantly told by call centre that this the best they can currently do. No other help offered, just blank phone line. But if I look on emirates webpage there is space on other flights! This is just not good enough. We paid in good faith months ago and are left with an unworkable feeble solution. We are governed by a flight time out of Athens to Santorini and a boat boarding time in Santorini. Someone should be taking responsibility and be helping us with a workable solution! Not a split touring party with more than 24h plus 10 hour delays!! And no solution since Monday this week :(