Best suggestion is give the card the flick. The ANZ capping of points is ludicrous. I used to put $ 15,000 per month through their card and ended up with 6250 points plus some bonus points. I swapped to a CITIBANK gold card(as second choice) and now get 1 to 1. Try a Platinum Amex ( as first choice, if accepted at outlets) and get 1.5 points per dollar to $ 100,000 pa.
Just work out the difference in points !!!
You would have thought after 5 months of dramatically reduced usage on my Gold Visa that ANZ customer service would have rung to find out why as no doubt they have programs to tell them,...but no call.