Westpac
Unable to process Chargeback

I transacted a purchase from Dealboard.com which I did not receive. After investigation PayPal could not assist due to being over their 45 day policy, they advised to contact bank and request a chargeback. The bank did not know initially what his was and then proceeded to inform me they could not put in a request for a chargeback.
On everything I have read about chargebacks the bank should put this in for me without question.
Wish to complain about Westpac for not processing chargeback and for Deal board in not supplying the goods in the first place.