Standard bank lost my title deed twice and did not respond to my complaint

Standard bank lost my property’s title deed, asked me to sign for them to get a certified copy of it on 2007, and now have lost the copy of the title deed. The property can’t be transferred because they submitted the original title deed (who knows where they found it again) and the deeds office wants the certified copy. I have logged a complaint with them but have received no feedback and they have not offered to get a new certified copy. I can’t request a copy because it requires me to sign an affidavit that I lost the original and the certified copy, And guarantee that they were not given as collateral etc. Etc: which I didn’t and I have no idea what happened to the title deed or what it was used for.