Standard bank - hiding information from the clients, refusing to provide information to its clients in order to clear all the allegation made by the clients against them

This bank is refusing to let us listen to our voice recording and to provide the payments recons for our three accounts to clear this matter. How come on earth the matter to be closed without being resolved? no recording was retrieved for us to listen to (even when it was retrieved, the bank official confirmed that he managed to retrieve it and when we supposed to listen to it, the same official did not let us listen to it said, he did not want it to disturb the meeting that we had with them which was just a lie as one of the main complaint was this recording and since then, the recording was not retrieved, we have been sent from pillar to post since 2019 April until now). one of their official contacted me and promised to assist me and what she did, she requested me to go to standard bank branch nearer to my place and asked them to request the recording so that we can go and listen to it there of which I did and she promised me that, the bond recon will be ready by the 28th of October. I went to the branch as requested and this is the response "This matter has been dealt by our DCC complaints and ruled on by the OBS before." and this is their the second response (from the same branch (the Glen South of Joburg) the first response was I should call the bank and request the recording and ask the bank to send it to the Glen where we can listen to it. while I have another email two weeks before this one where I was told that the recording is over 5yrs and it was destroyed as it has reached its maturity date. My question of which this will also be asked in the court of law is that, how can this bank close the complaint without providing information and also destroy the evidence while this recording was requested since from 2017? We were not afforded a chance to listen to the voice recording and provided with the recon for all three accounts that we had with this bank so how possible for the matter to be closed even ombuds failed us so we are demanding our voice recording and the payments recons and we wont stop fighting this matter using all the paper trails that we have as evidence. What this bank is doing it confirms that we do have a strong case against them because if what we said or allegations were incorrect, this bank would have long made us listen to the recording and provided us with the payments recons, now they are busy contradicting themselves.