Adjustment - how do I find out what it was for?

[gvloved1]

My June bill was slightly higher than expected.  The bill showed that there was an Adjustment - but there's no detail about what it was for.  I have tried to contact O2, texting #myO2 to 2020, several times over the last two weeks, each time getting a "We are busy" message in return.  Help pages on the O2 website are useless, and I keep going round in circles.  How do I find out what the charge was actually for?  The cost is immaterial - it's the frustration that I'm finding it so difficult to obtain what should be straightforward info that's got to me now - thanks in advance

[MI5 · Accepted solution]

@gvloved1 

Adjustments can cover many things and it isn't always clear unfortunately.

A common reason is the end of a discounted tariff period for example.

There are some numbers here to try Guide: Coronavirus Community Help and Support and 

advice from an O2 Guru to get through:
If you call 202, when it comes to the reason you are calling stay silent for 15 seconds and you will be taken to the keypad options.
Press 2 for Everything Else
Press 5 for More Options
Press 7 for Anything Else which will put you though to someone.

[gvloved1]

Many thanks for such a complete reply, much appreciated 

[MI5]

You're welcome.