eFlow payment page issues

Has anyone else ever had issue where the webpage tells you there has been an error with payment but you get charged anyway?

I've only used the site twice, first time the page seem to crash then it tells me there was a problem with payment and on the third attempt I tells me it was successful, later I look at my statement and see I had actually been charged multiple times.

I contact eFlow they refunded the money so no big deal.

I use the site a few months later same things happens.
Reason I ask this is, it was only by chance I actually looked at my statement other wise I would of missed it, it was only 6.20.

My dealings with the staff at eFlow are that they are generally very helpful and will clear up any issues you might have and wave penalties if you have a genuine reason to why you did not pay the toll.

That being said this is still a company that will attempt to charge you 41 euro per journey if you fail to make good on payment within 14 days of travelling on the M50.

Does anyone else think this excessive?
Also 14 days, I would say a large number of people see a fine of 41euro x 2 before they are even aware they owe any toll at all.