FNB pending transactions are really a pain in my ass!!

I purchased a flight ticket with CEMair, bus tickets with greyhound and intercape on the 6th of August. Its the 8th of August all of these transactions has been pending. I am about to loose a seat on CEMair because they cannot release a ticket until the funds have been cleared. My son will not be able to travel because Intercape cannot send me a ticket because pending transaction means no booking. This money has been deducted from my account already. Does it mean I have to rebook these tickets again, really now this is frustrating. Why cant the bank reverse the transactions into my account then if they don't want to process them?