Vodafone Dongle Connection limits?

Hi
I have a Vodafone dongle, and when I pay EUR20 I get 5000mb, which is fine. I have around 3800mb's left, but I keep getting a message before I connect saying:
the connection limits set in settings/usage/lmits has been reached or exceeded, Connect anyway?
The first few times this happened I connected because I still had megabytes left, but now I am worried it might start charging me. I checked the vodafone website and I have searched on google but all of them keep telling me to go to View usage and then limit settings, but I do not have the option to go onto limit settings
Please Help!
Thank you
 
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