Had calls from a weird overseas number lately?

If you received a phone calls from an unknown overseas number yesterday, you weren't the only one. In the past few days there's been an increase in attempts at a spam technique known Wangiri. News-hub has been contacted by dozens of people over the past 48 hours who have received missed calls, usually from numbers beginning with 0088 or 002, originating in chad, a landlocked country in North Central Africa.