If you really must insist on 'exact change only', is it too much to ask in this day and age that you put a comprehensible list of fares on your website so we can actually have the exact change ready before we step on the bus?
Could you possibly advertise your fare changes a bit more prominently and for a bit longer, so that I don't get caught out every single time I come back from holiday?
Could you possibly make your fares a bit more logically consistent, so that a single fare after 9 or 10pm (or whenever the cut-off point is - another mystery) doesn't somehow end up costing more than a return normally would?
Thankyou for your inattention.