You probably don't need a lawyer. These guys worked well for me in the past for rmost issues involving rent owing and or not leaving when evicted...
http://www.serv-it.ca/tds/
These guys are similar..
http://ccebailiff.ca/ab/our_services...BTABoCL9_w_wcB
Unique problem though? I have a very cheap, indepndent lawyer who is competent in most fields (actually very good so far). I'll send you his info if you want. But it might be overkill hiring a typical Calgary legal firm.