もちろんできますよ。というか辞めるの待たずに再度請求すべきでしょう。
相手が聞く耳持たなかったらこれを参考にしてください。
http://www.labour.gov.bc.ca/esb/esaguide/#16からの抜粋です。
Resolving Disputes
Employers and employees are encouraged to resolve disputes themselves. The Director of Employment Standards can refuse to investigate a complaint if an employee has not taken steps to resolve the problem with the employer. This includes using a Self-Help kit that is available online and at all Employment Standards offices.
If a dispute cannot be resolved using the Self-Help Kit, a complaint may be filed using complaint forms available at Employment Standards offices and online.
The Employment Standards Branch helps many employers and employees to resolve complaints informally. If that is not possible a decision is issued which includes mandatory administrative penalties.
Factsheet: Complaint Resolution
Contacting the Employment Standards Branch
For general inquiries, contact the Employment Standards Branch Information Line at:
1 800 663-3316 (toll-free in British Columbia),
or 250 612-4100 from out of the province or within the Prince George area.