Why are funds not debited at the tariff in tele2?

Question

Mobile devices

A long time ago I set the tariff 'Internet for devices' (tele2) on the phone, because I liked the per-second billing. Also, the Internet is available at the tariff (if you do not connect its packages, then 1.8r per mb), in one situation it was necessary to use it and I noticed that the money for the traffic (several mb) had not gone, after that I checked it several more times, the money was just are not written off. I would like to ask if they can write off later, and what could be the problem at all (old sim card (10 years :) ), insignificant waste of traffic) ...

Answer 1

Yes, they can easily write off at least once a month.