The instruction leaflet included stated that if I topped up £10 a month I would get 300 Texts and 500MB of Mobile Internet so I did it and I then got a text from them stating you now have 300 texts and unlimited Mobile Internet, which one is right because if I only have 500mb and they charge me if i go over i am going to be really upset.

Their text and web tariff comes with a set amount of texts and 500mb data for internet usage. Some mobile phone companies class 500mb as unlimited usage.

If you're worried about what you're using, you can keep an eye on things by dialing 4444 and selecting option 2 then option 2 again. This will inform you of how many texts remain and internet usage.