Shocked by Nedbank's after sales client care and systems - DISAPPOINTED

I know i came raving about Nedbank after i opened my account, but to say i am disappointed in their after sales client care is an understatement. So Nedbank has the greenbacks rewards program which i signed up for on account opening. I was informed i would get 1 greenback point per R10 swiped. When i received the greenbacks statement some of the transactions were not on it and i logged a query with the bank about 6months ago. I was also told i needed to apply for the american express shoppers card to double my points, which i did and collected from the branch about 5 months ago. My greenback points have reduced since then and i phoned to log a query on the 1st on November and was told someone would get back to me reference number ********** 7 but still noone has even bothered to contact me, i called in again today 2weeks later and i'm told i need to get an american express shoppers card linked to my account (i received one 5months ago???). What is happening with this bank, numbers are my forte and besides the fact from a bank statement anyone can calculate how many points are due from each R10 swiped on the account (besides even the double points due) but the calculations seem to be escaping the Nedbank systems. This is very worrying for a finance house.....very disappointed :(