Is this false advertising?

In Australia, cents are rounded off. A pack of wrigleys cost for example, $1.98 but because I paid cash it gets rounded off and in fact the chewy cost $2.00. The next customer purchases the same brand of chewy except she used her card and only paid $1.98 which is the advertised price and 2cents less than I did. I think this is false advertising...what do you think?