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Had my WiFi box since September and iv never gone over my limit I am always well below it. When I signed up the guy told me I couldn't go over it it would just stop working. Surprise surprise this month I'm getting charged an extra £52 for going over it by 2gb! It's a joke as I have a tablet with Vodafone aswell that iv never used the data on since I got it but I go over once and apparently there is nothing they are willing to do about it! I pretty much got told that it's tough! I think it's disgusting they treat their customers like this!
As far as the data cap is concerned, the restriction if off by default and to prevent you exceeding the data limit, you need to enable the cap. Please see below.
Please also refer the link below, this will help you avoid going over the allowance.
@Josh wrote: We'd love to take a look into the charges for you and investigate why this wasn't capped.
Why, oh why, doesn't Vodafone engage the cap by default? It only takes one opt-out, and you're opted out until you change your mind and opt back in. As far as I can make out, the other networks cap by default, and they get extra cred for not landing their customers in the mire like this.
Vodafone's position on this isn't widely understood or realised - not even by some of their sales advisers, it would seem. It really isn't enough just to have it in the small print.