Hi Chief,
I'm very sorry about this inconvenience, but if you did not receive gems nor a receipt for your order, it's likely that it was cancelled by the Google Play Store. You will not be charged for any cancelled orders. However, it is possible that the Google Play Store put a temporary authorisation on your credit card, equal to the value of the purchase you tried to make. This authorisation will clear automatically.
If this is not the case and you can confirm that your order was completed and charged, I’ll be happy to help. Just get back to us with a full Google Play Store receipt that shows the transaction ID for your order. Unfortunately I can’t confirm an order only with a bank or credit card statement.
If your purchases continue to get cancelled for no obvious reason, please visit https://support.google.com/googleplay/digital-content/?hl=en for help