Unpaid HealthyFood cashback 6 months later - Discovery is in disarray

Discovery messed up their HealthyFood calculations in August 2020 and shortchanged me by over R1000. They acknowledged the error but 6 months and probably 40 e-mails later they still are unable to resolve this. I e-mail every week or so and hear that they are "still working on it". Seriously, 6 months and they can't fix this!!! I think Discovery have some serious issues in their internal systems - makes me very nervous about them managing anyone's money. I am considering taking this up with the Ombudsman.