A missing decimal point — that's all it took for a Guelph, Ont., business owner to lose tens of thousands of dollars and face months of frustration.

Christos Kyriacou owns the popular Angel's Diner, a 1950s-themed restaurant on the edge of downtown that has been around since 1996.

Three months ago, Kyriacou went about paying his internet bill on a banking app, like always. But instead of sending the $341.26 he owed, he missed the decimal point and accidentally sent $34,126 to internet provider Be…