The settlement is coming into force between now and April and fees (for retailers) are expected to reduce.
If a retailer charges you a surcharge to cover the interchange costs, then that is what it must do. It would be misleading under the Fair Trading Act if a retailer used the surcharge to increase revenue. So a surcharge should represent approx. 1% to 3% of the purchase cost. Interestingly, this means that the surcharge is being charged on the GST component of the sale!
If you disagree with being asked to pay a surcharge for paying with your credit card, you could suggest to the retailer the following points:
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If you have been charged a credit card surcharge previously (before the settlement), you should ask the retailer for a copy of the invoice/receipt. This may identify the reason for the extra fee. You could contact the retailer and ask them if their Merchant Agreement permitted them to levy a surcharge. You should ask them which bank they use. You can ask for the surcharge to be refunded to you if you believe it was not proper. It may take some time.