NEDBANK - DOUBLE DEBIT

i HAVE A nedbank personal loan which was up to date for over a year . I have fallen behind on payments . I have tried calling your call centre and have return calls I have got but to no luck to speak to someone . Its very difficult to get a hold of someone to talk to . I recently checked my account and seen Nedbank double debit my account . PLEASE NEDBANK reverse double debit and contact me or give me a tel number where i can make a suitable payment arrangement . this is a huge amount and Im not left short for my rent and lights and water account .