I made an online payment for airline tickets to Flightsite and the amount was deducted from my FNB credit card

I made an online payment for airline tickets to Flightsite and the amount was deducted from my FNB credit card. The merchant however confirmed that the flight booking was not confirmed and that they reversed the authorization to my credit card. However when I approached FNB I was asked to fill out a dispute form which I've done. They have then advised that it will take 30 days to resolve even though the merchant has been forthcoming and provided the necessary information showing that the funds were not received by them. The funds show as pending on my credit card statement. Surely, this is an easy reversal from FNB and should not take 30 days. Also I'm scared that the funds are now showing as pending on my statement but soon FNB will release it to the merchant after which we will then need to arrange a refund from the merchant which could take longer to resolve. Please help.