If a completed transaction is still showing in your account, there could be a few possible reasons why this is happening. Here are some steps you can take to try and resolve the issue:

1. Check your cash app account balance: Make sure that the transaction has been completed and that the funds have been debited from your account. If the funds are still in your account, the transaction may not have been processed properly.
2. Check the transaction status: Look for the transaction in your transaction history and check its status. If it says "Cash App Pending" or "Processing," it means that the transaction is still being processed and will likely be completed soon. If it says "Completed" but the funds are still in your account, it could be a technical glitch or error.
3. Contact customer support: If the transaction is still showing as completed but the funds are still in your account, you should contact the cash app customer service team for the app or platform where the transaction took place. They should be able to investigate the issue and help you resolve it.
4. Be patient: Sometimes, transactions can take a bit of time to process and show up correctly in your account. If you've checked your cash app balance, and transaction status, and contacted customer support, and you still don't see the funds reflected correctly, the issue may resolve itself in a few hours or days.

Remember to keep documentation of any communication you have with cash app customer service and any transaction receipts or confirmation emails you have for the transaction. This will help you in case you need to escalate the issue further or dispute the transaction.