So disappointed in this bank

I got refunded a substantial amount of money by a company which went to an account I had with absa and absa have told me they are keeping the money. The money was paid to aforementioned company on 1st February 2019, my account with absa was closed on 9th March 2019, and the refund payed back to the account on 1st April 2019. To try get the money back I have phoned absa several times, emailed debit card disputes, emailed absa claims, left a complaint on hellopeter and been in to an absa branch. And through all of this have been shunted from pillar to post with no-one at ABSA providing me actual help on getting my money back. They now tell me 24 days after the refund was made that the money will go towards a credit card debt I had on a card from over 10 years ago. This was a credit card I had prior to sequestrating through the courts, which happened on 5 February 2010. Absa should consult the attorneys handling the liquidated estate to recover this debt and I am absolutely certain they cannot come after me personally or seize any of my money post the sequestration date for money owed prior to sequestration date. This is completely *******! So I will take absa to court if I have to to get my money back and it will be a case that they cannot win because what they're doing goes against the law of land. They have no leg to stand on whatsoever. What a deplorable bank. I am so glad I have no ties with them anymore apart from this.