A charge in your wallet looks wrong
Start with your wallet history. Every credit and debit is recorded there with a description and a reference, which shows what each charge was for.
Two things are paid from your wallet: plan payments and advertising. A plan charge names the plan and appears once per period. An ad charge appears when you add budget to a campaign. It moves credits onto the campaign, and unspent budget can be returned to your wallet at any time with Refund unspent.
A credits purchase that did not arrive
A Google Play payment that is still processing shows as pending, and the credits arrive when it clears. If Google Play confirmed the charge but Sebairo could not yet verify it, delivery is retried automatically. If the credits still cannot be delivered, Google Play refunds the charge.
Refunds
Google Play refunds credit purchases under its own rules. Request a refund from your Google Play order history. When Google Play refunds a purchase, the credits it bought are removed from your wallet. A plan payment is not refundable, but switching plans returns the unused part of the current period as credits.
If something still looks wrong, email support@sebairo.com and include the reference from your wallet history so we can find the exact record.