Nedbank Lost our Title Deeds

We have had our current bond with Nedbank for the past 4 years or so, we are now selling our property. The lawyers from the place we are buying are ready to lodge for registration but the sale registration is held up because Nedbank lost our title deeds. We were informed of this 2 weeks ago, we then went to the lawyers to sign a affidavit so that new once can be drawn up. The clerk from the lawyers has been going to Nedbank every day for the pas week only to be told it is not ready yet as it still needs to be signed. Meanwhile we have made plans and arrangements to move as we were told registration should happen next week. We are very frustrated with the time it is taking for them to issue new title deeds and basically frustrating a customer with their negligence and then affecting us negatively. I would like some feedback on this, or answers or timelines, because the time this is taking is not acceptable. M