eBucks Double Up assingment issue open for more than a month.

I raised various complaints (references ***NF, ***NF, ***Q) and disputes on the 'Double up your fuel with Engen' eBucks allocation. The Engen Petrol Station used a standby credit card machine and FNB said it is not Engen and they penalised me for "non-Engen" fuel. I then went to the Engen and asked for a letter that I used an Engen for the transaction in question. I submitted it FNB eBucks a week ago and still no allocation of my double-up that I qualify for. FNB is making this my problem and I am wasting time to fix their mistake. It is now more than a month and this issue is still not resolved. See my complaint reference numbers.