Failed chargeable picture messages

[vonnielol]

I have been charged for 3 picture text messages . 2 I know failed so I should see a refund but it's not showing. Does anyone how long this takes? 

[PandJ2020]

If you've been charged then that's that.

Unless Sky have agreed a credit then nothing will be forthcoming.

You are charged for the MMS leaving your device - a failure to fully send (e.g. wrong number) won't necessarily be a valid reason for reversal.