Poor service regarding resetting business account mandate.

Since May I have been trying to get the mandate on my Business account (DELIVER 078 734 NPO) reset since the second signatory resigned. So that I can then transfer money into an investment account. I dealt with someone called Millicent in Permissions. Since late May I have heard nothing from her despite sending all necessary documentation. On 24 June I spoke to a Lincoln Aphane in the Business Division about the lack of progress - he said he would have the matter escalated. I receive an email on the 25th from FNB saying I would hear from the bank within 3 working days - no such communication happened. So on 6 July I try calling Business division - after explaining my situation, two different consultants just put me on hold - like passing the buck. The third consultant - Ethel - said she would follow up on this and at very worst I would hear from her by morning of the 7th - nothing. I have lost patience with FNB's lack of interest or incompetence or laziness in trying to help one of its customers - you pick the appropriate judgement. If "How Can We Help You?" means so much to the bank, perhaps it can try helping me.