Discovery Heath disappointment!

Called discovery regarding a debit order bouncing and been charged an unpaid item fee. Notified them that this debit order was going out of the wrong account or old account for the past 3months! Despite the bank submitting a debit order switching form. Spoke to a consultant who informed me that they do not accept 3rd party requests such as the bank requesting change of banking details however discovery did not feel it important to inform me as the member that this has been rejected and how to go about changing my banking details. The consultant repeatedly explained that it needs to be done on their website and she cannot assist me over the call due to confidential reasons. This was understood and acknowledged however before asking her to email me the form for the banking details to be updated or asking her for their details to do an eft for the bounced debit order she had hung up on me and did not think to call me back.