Acc freezed

On the 23rd of July received sms from Capitec bank saying that they detect *****ulent activities in my acc and my bring proof of where the money was from.Which i did they asked for certified id copy ,affidavit ,proof of deposit from my fiancee.Than said i must wait for 24hrs did bt today called for follow up they say i must wait 43 to 72hrs .The money is from my fiancee s package from work Is this fair how they treat us as their clients