Yesterday I checked my Credit Card balance to see if I had been repaid/credited by a services company that hadn't delivered. The amount was there and showing a a pending transaction. Today i checked to see if it had processed and it had disappeared altogether.

I checked that it hadn't been processed, which it hadn't, then double checked by adding my outstanding balance against my credit limit and, again, no sign of the repaid/creditted amount.

Why might this be?