CIC is in their full right to deny any person any kind of temporary permit if their requirements are not met. It's nobody's right to get a work permit or a TRV. You are at the mercy of CIC.
Look at the quotes below. Basically it says you have the right to apply. It doesn't say that you have the right to be approved. For a temporary worker who got a work permit by proving that he would return home because his family is there, when the family applies to join him, they may be seen by the visa officer has having a risk of overstaying.
Your spouse or common-law partner and children can come with you to Canada or visit you in Canada, but they must meet all the requirements for temporary residents to Canada: they must satisfy an officer that they will only stay in Canada temporarily, and they may have to prove that they have no criminal record.
For your spouse to apply for a work permit without an LMO, you must meet the following conditions:
1. You must be authorized to work in Canada for six months or longer.
2. The work you are doing must meet a minimum skill level (usually work that would require at least a college diploma). Specifically, your job must be listed in Skill Level O, A or B in the National Occupational Classification.
If you meet these two requirements, your spouse may apply for a work permit that is “open” and that will allow her or him to accept any job with any employer.