I count 11 ridings that have so far been linked to allegations that voters were called about their polling stations: Guelph, Kitchener Centre, Kitchener-Conestoga, Kitchener-Waterloo, London West, Parkdale-High Park, Nipissing-Timiskaming, Elmwood-Transcona, Winnipeg South Centre, Sydney-Victoria and Saanich-Gulf Islands. (For sourcing see here, here, here, here and here.)
Meanwhile, the CBC now has a list of all the ridings where changes to polling stations occurred during the last 24 days of last year’s election. Of those 11 ridings that are the subject of alleged phone calls about polling stations, I see four on that list: Kitchener Centre, Kitchener-Conestoga, Guelph and Parkdale-High Park.
The other seven are not mentioned.