FNB refuses to immediately put me back on a Premier account after wrongly putting me on a Private account immediately

I had a terrible experience with FNB yesterday.

I am currently a Premier client. I logged onto my banking app, and there was an ad or offer (which I admittedly did not read properly, due to the fact that they are constantly offering me things I don't need and I just wanted to get into the app to do what I needed to do) - I clicked on "continue" or "accept" and WITHOUT ANY CONFIRMATION message, WITHOUT ANY T's & C's, I was IMMEDIATELY upgraded to a Private Client and FNB IMMEDIATELY deducted money from my account.

Needless to say, I am very annoyed with this. The least the app can do is to have a confirmation message when something has a financial impact.

I phoned to rectify the mistake. Apparently it will take 7 DAYS to downgrade me back to a Premier account again. So, in instances where FNB will make more money, there is no red tape to upgrade a client without even giving T's & C's or a confirmation message. But in instances where clients will pay less monthly, it will take up to 7 days..

To make it worse, the consultant assured me that I wouldn't have to pay for this Private account for the following 7 days, even though FNB immediately deducted money from my account.

I am utterly disappointed.