Is there anything else I can help you with today? Customer: no Okay well if there is anything else you need please don’t hesitate to call us. enjoy the rest of your day goodbye for now.

Have I taken care of all your concerns today? Did you have any other questions for me?

The other answers give good alternatives but it should be clarified that your proposals aren’t good. They sound rather rude and dismissive in the customer support context. You might say those phrases if you talked to someone everyday and both sides know that you are required to give them certain information.

Is there anything else I can help you with is the most common way to end a customary service call or speaking exchange.

....do you have any questions ...did you understand everything clearly