net keys on mobile phone careful!

Many months ago i bought a new mobile phone which i thought was a great bargain and in most ways it is until a few weeks ago i decided to do a check on how much the internet was really costing me.I 'M on o2 prepay so i noted my credit and after the merest touch on the net key i made a second reading.On the first touch of the key i was charged 50cents without any surfing at all .2nd touch 30 cents and third altogether almost 1 euro.Around and not more than 1 euro per day is a lot of money over 18 months to someone on welfare.Accidently only touching either internet key costs money and i wondered how many people lose euros without noticing .I got o2 to take off the internet as i was finding it impossible to do it my self. page unavailable etc.The man in the o2 shop removed it for me after a second visit . I don't wonder about my credit any more and i'll probably never get justice on the matter.