Sounds like your number may possibly have been used as a fake caller ID by scammers. The scammers seem to be increasingly using real numbers rather than random/made up ones, based on recent posts on here.
The scammers usually change their fake caller ID numbers regularly, so any inbound calls to you may well subside on their own.
If you continue to get more calls, you can leave a message on your answering machine advising what has happened and see if the calls subside.
If they don't, you/VM may need to take further action.