Hi
Data is in my opinion the most expensive part of a tariff for networks to provide and also part of a tariff allowance many want more of.
A link that may be of interest.
http://www.vodafone.co.uk/explore/costs/data-costs/index.htmI'd suggest using the 'Contact Us ' tab at the foot of the forum page to either speak to customer services by phone or use live chat to go over your options.
Also try to use WiFi when and where you can. I personally turn off Mobile Data while on wifi because the iPhone can switch back to network data if wifi signal dips or when the iPhone screen goes to sleep.
Current Phone >
Samsung Galaxy s²⁴ Ultra 512gb.