Lack of response after numerous guarantees

So in short. I was querying interest charges for a late payment. Resulted from due date being on a weekend which apparently is not general banking practice? Transfer only reflecting the Monday instead of the weekend.<br> <br> Logged a query online - guaranteed response in 24 hours. - nope<br> So I call, re-explained the case to agent, they mailed to explain case to manager who could make a decision. - no response<br> A week later after no response I call again - re-explain my case and request - promised to call back before 5pm, and they would investigate.<br> Another week later after no response. cal again - see above - same result - promised to investigate and call back by 5pm.<br> <br> We are now on the next day. I am getting frustrated at the lack of response. And would still like my case looked at.<br> <br> In Discovery's defense. I did eventually get a response to online query - not addressing the request, but rather explaining why I was charged. Yesterday I had a missed call from a private number - no message or call back.. but that's pretty much the extend of response received to date.