Canada Life Owes Me $1,000 and nothing is happening

I have a total three claims with Canada Life for which they owe me more than $1,000. The first claim dates back to September and should yield a payment to me over $400. They asked for certain documentation which has already been provided. I called in November and December and both times they said they would escalate the claims for payment and should get money in the next 5 business days. Of course I have not seen a cent.

How can I escalate it? Is there an Ombudsman? Would my HR be able to help? My union?

Help!!