This is bizarre.
I forgot to turn my wifi back on on Friday when I got off the train (train wifi variable so at times best to turn off and use 3G to send messages)
My Vodafone app is updated to 8pm last night and I had used just under half my data allowance then, which is about right.
Overnight I have had a host of texts from Vodafone, approximately 20-30 minutes apart, to say I am close to my data allowance, I have gone over and spent £6.50 etc right up to £26 being spent at around 5.30 this morning.
I don't think I have automatic updates or anything on, so what on earth has happened? It's not a great disaster but it's a bit irritating!