Bidvest Bank 2024 mandate system problem

Bidvest Bank 2024 mandate system problem. Mandate system should have been reviewed before sending out to customers. Very poor show. I have been trying to get thru to Bidvest for the last 3 days as there is incorrect information on the Mandate I need to submit. Phone calls are answered with an automated message then it rings and cuts off. I have also sent emails but still no reply. I need to get this sorted so that we can receive our money sent to us.