Why has my Classic PAYG balance increased?

[JohnJohn]

I checked my balance on 18 september and it was £8.52. 

I did not use the phone until I check the balance again on 29th october and it was £9.29.

Why has the balance increased?

[TallTrees]

Hi there @JohnJohn 

Welcome to the o2 Community Forum

We are a customer community and have no access to customer accounts, but can advise;

Seems that you would need to ask o2 customer services if they can tell you they have a Social Media Team here:If this helps and it works for you the
Social Media Teams will be on hand just
send them a message
https://o2uk.co/O2CFB
https://o2uk.co/O2CTW
https://o2uk.co/O2CIG

FACEBOOK  TWITTER AND INSTAGRAM

[MI5 · Accepted solution]

@JohnJohn 

If you use any amount of data, O2 take £2 from your balance.

At the end of that day, they refund the difference between the £2 and the actual amount of data used.

This explains why your balance can decrease and increase over a 24 hour period.