Thank you for sharing your situation and question with us.
It sounds like you have already taken several steps to try to resolve this issue.
We have found some interesting and helpful suggestions from this worker’s guide,
and
You have already taken some of the steps we would recommend such as contacting your employer and Service Canada.
If you need your ROE for the purposes of Employment Insurance, you can also submit a Request for Record of Employment form to Service Canada so that they can obtain your ROE on your behalf.
Some people receive electronic ROEs from their employers. If you receive an electronic ROE from your employer, they don’t need to give you a paper one as well.