Just reading the online news and found out about this, which I wasn't aware of before
http://www.stuff.co.nz/business/money/8766549/Telecom-adds-surcharge-to-credit-card-bill-payments
Not aware of any other providers doing this yet, although my old ISP used to offer a discount if paying direct debit over credit card.
I pay by farmlands, so presume it will not be affected