Frozen account

On the 1st of January I received a payment of R50 000 from one of my business partners coming from Nedbank. It was later discover that Nedbank called discovery to report the transaction as suspicious. Discovery has since blocked my account and even after numerous attempts to have this fix they have refused. I have provided the bank with all proof of transactions dating from the day the account was opened what's more irritating is that on the 28th of December I made a Avis car rental wherein they hold a deposit upon returning the car Avis has since refunded my account to the tune of R6900 discovery is refusing to give me access to my money. This is really inconvenient especially in such trying economical times.