Had a contract with Vodafone for 2 years. 100gb of data. No capping abroad. £20 a month. Got an email about a month ago saying this would increase to £22. OK with that but I decided to check my data useage for the month....well below my allocated 100gb but spotted my bill for the month had gone up to £42. Only spotted it last night . They never contacted me to tell me so will phone/ contact them asap.