Inaccurate rewards calulations

I noticed that some of my Sasol transactions on my credit card are not calculated into my monthly ABSA Rewards. I sent through a query on the 6 September. I then followed up on the 23 October and then again on the 9 November. To date the only response is " we are working on it". This is the 2nd time that errors in calculations have been made. It is very disappointing to experience such poor service and also very concerning that ABSA is robbing clients. I am a Private Banking Client but this seems to make no difference trying to resolve through these channels either.