Sorry I can't be of any real help - but.
I did search the online White Pages Directory MyTelus.com
http://www.mytelus.com/phonebook/index.vmfor the Surname TESLAK - Alberta.
There are 6 Listings - all in Calgary Alberta.There are 63 TESLAK listings Nationwide -
Perhaps the Calgary are family connected to your research.
Cheers, Stella