Some background. You were obviously on operations because you were on Class C. This means, essentially, that you have been a "Regular Force" soldier for the duration of the contract. At the conclusion of the contract, it is terminated and you were "released" (literally) from the Class C.
Because that's the way the system works, retroactive pay inquiries are handled by (believe it or not) the pensions people in Ottawa (DPS 6 to be exact). These are the people your OR should be talking to as they are the ones who authorize the pay. You are allowed (at least in LFWA) to speak directly to them to keep addresses up to date (critical for retro pay) and to ask questions.
Internet site:
http://www.admfincs.forces.gc.ca/pension/intro_e.asp
DIN site:
http://admfincs.mil.ca/dappp/ps
Toll free number: 1-800-267-0325