Appalling service yet again

I've had a Nedbank account for several years and in the last month I've had several unknown debit orders totalling R4000 or more going off on my account. I've called, chatted and emailed Nedbank regarding this and I've been told these are mandated and can't be reversed. I've spoken to several agents and a team leader Nasreen and no one is able to assist. I've called over and over again and these funds still have not been returned. I've now resorted to closing my Nedbank account and on two separate occasions the call agent has told me I'll get a call from a manager Lindiwe. Today I'm on the phone with Olwethu whose telling me to deposit money into the account to have it closed. I've requested his manager and have been Nokukhanya whose told me she can't assist and I need to hold for 10 minutes for the some desk to open. Your service is appalling and so is the service of your management. I want this account closed with immediate effect I'm not depositing a cent into it.