Discover bank rewards not resolving a bank technical error now I must pay R400 towards iPhone benefit

This doesn't even deserve a one star-on the 26jan I needed 3points to close spend goal, so I bought R50 airtime(I actually needed about 330 points, so I first paid woolies and after that needed only 3 points, so I bought R50 airtime... The bank then said payment can't be done etc (error message) but then I received the airtime which obviously means it is paid and money was taken off my card, but the problem is now Discovery bank put this R50 in the 27th Jan not for 26 Jan which it was meant for...

On the morning of 27 Jan I logged a call to complain about this as this now meant I didn't meet my spend goial cycle closing 26 Jan, which means I'm going to pay in for my iPhone benefits -

According to them it takes up to 48hrs to resolve an issue, I didn't hear from them, I phoned again on 31 Jan and was told it will be resolved by the time I phones are paid on the 5th feb... They still ask me to email them my spend goal and iPhone cycle, I don't know for what cause they have access to all this info

As I type this, it is the 5th feb, I've an invoice that I must pay in R400 towards iPhone benefits, because obviously they didn't resolve the R50 issue.... I'm on the call with an agent and he is telling me they are still waiting for IT department to put the R50 to Friday 26 Jan.. How long does that take??

I must pay R400 out of pocket for a bank error, how is this my problem?

I need this resolved ASAP... I do not like being inconvenienced at all

I know my Discovery products and benefits and I know what to do to meet them, and I meet all of them as I'm supposed to, so can Discovery also pull their own side of the bargain fairly please

Ref numbers logged 27 jan=***jan=***0