I used my credit card for a purchase the Wednesday after last and it has yet to show up in the transactions list on my online banking. Everything else is there. This has not happened before. Does anyone know what is going on? Surely the charge went through because they gave me a receipt.

sometimes it takes a month call your credit card company

Yes, this is not a regular problem. Either the transaction did not go through properly or it was rejected later by either of the party. You may get more information from the company itself.