A couple of times we've received calls from the other end of the country telling us they'd received a call from our number and they'd dialled 1471 to find our number and called us back. We've made no such call. It's happened about 3 times today and I'm not sure what to do about it.
You number may possibly have been used as a fake caller ID by overseas scam callers.
Usually the scammers change their fake caller ID numbers frequently so you should hopefully find the inbound calls back to you will die out on their own in due course. If that doesn't happen, there may be a different reason for the calls, requiring investigation by VM.