give me my usage details

I recharged my o2 number for €15 on 2nd July 2016. I used internet for 2 mins on 2nd evening after which i got a message from o2 that i have used internet so they have put a plan of 90 cents per 30 mb per day and it will be valid only if i use data on a day. I checked my currency balance and it showed €14.01. Next day (3rd July 2016) I tried to make a call but it didnt happen so i checked my currency balance and voila! it should €0.0!! can someone please let me know what exactly happened to the balance in o2 sim.

Thanks in advance!