We're sorry you're having trouble with your call. There are several reasons why it might happen. Please consider the following ones: You might want to try adding the phone number without a zero (0) at the beginning, make sure you're always using the right country code (such as +1; +58; etc), and always notice in advance the person who's receiving the call so you don't miss your 3 attempts before the call expires.
If none of this works please try these troubleshooting tips that may solve the problems you're having:
If this doesn't help, this may be an issue with the connection speed, so knowing what your upload and download speeds are will help narrow down the problem.
If on mobile
If this doesn't help, please uninstall and reinstall the App.