Toll Company - i'm really angry now....

Who knows that for a toll tag to not work in your car you have to wrap it in foil!!!???

So, back story...
DH has a wk toll tag that we use on w/e's etc and I have one also that i use during the week.
A couple of weeks ago, I took DH to the airport for the weekend and had his toll tag in my car and mine in the glovebox However, when I went through the toll roads, both tags beep - despite only one being mounted to the windscreen.

I rang the toll company to say i've been charged twice and can i get a credit on my account as my toll tag wasn't mounted and therefore i shouldn't have been charged.
I rang to day to follow this up as it still hasn't been credited. Despite them advertising all over the website, in all the paper work and on the toll roads that if the toll tag isn't mounted properly it won't work, I have still been charged. When I said this to the girl on the phone she told me that if we were going to do that, it had to be wrapped in foil? When I asked her to show me where in the paperwork it says that, her response to me was "it doesn't". How many people think to do this?!?! How many people are like us and are being charged twice for tolls but don't check the statements??

Then she tells me that it will take 4 weeks to credit my account. Again, not accepetable in my opinion. It's not that hard to compared the 2 statements with the times and dates and see its been charged twice and credit it.

So now i'm fuming. No credit and people will continue to be ripped off because of false advertising of this company. GRRRRRRRR