Change of banking details

Good Day, I have been trying to get hold of customer care since Monday, after realising that my debit order did not come off this month. My banking details have recently changed and I would really like to ensure that they are updated so that my debit order can still come off this month! When I request to talk to a consultant on the customer care line, the phone just cuts out and when I gave in my details on the autopage website, I received an email to say that I will be contacted within 7 days! This is way too long as I need to ensure that my debit order goes off correctly and that all is in order.<br> Please note that this is not a complaint and that I am desperately just trying to get assistance to change banking details.