Incorrect Fees

In general I'm a big FNB fan. But on this occasion I've been let down.

I was charged interest on my credit card incorrectly. The card is 55 days interest free. I know all about exception transaction that will incur fees. I enquired about this and was reimbursed for some of it. I enquired again. And again. I just get no feedback when you submit complaints via mobile app > contact us. You get an email saying someone is attending your query and 99% of the time you just don't hear anything from FNB.

And the secure chat is very unreliable. The messages doesn't come through when it's supposed to. And no, it's not the settings on my phone. I get cut off numerous times and just adds to an unleasant experience.