Discovery Bank VERY poor admin

So, long ago Discovery used to open bank accounts via RMB where you can receive benefits etc. We opened one of these accounts years ago and have actually forgotten about it. Since then, Discovery Bank got established and the account was thus transferred to their systems. I receive a call out of the blue stating that we have funds outstanding on this account, fine, so I ask them to email me the details so that I can pay the entire outstanding amount and then close the account all together. I have no interest in having an account with Discovery Bank. After three phone calls and empty promises I still haven't received an email. I do get threatening sms's about being handed over etc but no help at all to close the account, paying into what account number and so forth. This is pathetic Discovery. Don't send me threats when your admin is up to *******. Sort this out please so we can part ways soonest.