You welcomed them nicely, so why not do the same at the end of the call. Suitable for the end of IVR surveys or similar. There's not much else to say really, either here or on the call!
 
Please don't hesitate to drop me a line if your needs aren't met in the telephone message shop.
 
Here's a few templates you could use to create your own:
We appreciate your call. Have a great day!
Thanks for reaching out to [business name] today. Take care!
Your call means a lot to us. Goodbye!
It was great speaking with you. Goodbye!
Thank you for choosing [business name]. Have a wonderful day!
We're grateful for your call. Farewell!
Thanks for calling [business name]. We look forward to talking again soon!
Have a nice day, and thank you for calling!
We value your call. Goodbye for now!
Thank you for your time. Goodbye!
 
"Martin has been fantastic to work with, and we look forward to working with him in the future. He’s created an on hold marketing message for us with a greeting message far more in keeping with our company profile. Martin comes highly recommended by us!" - Review from google