I usually press 1-1-2-2 when I call them (1-888-242-2100) and would have to wait 30+mins, have you tried calling them at different times of the day? You might face peak hour calls and there were many times when I tried to call for 3-4 days in a row and couldn't get through, when I tried a different time, it went through much easier.
If you do get through, mention that in your GCMS notes that your application is approved and you and your partner are in Canada waiting patiently for COPR. Repeat that important fact that both of you are approved and are in Canada. Ask them if the address details and contact numbers are the Canada numbers/ address too.
Another way is what @legalfalcon mentioned for me, " If your GCMS notes show that your application is approved, you can send a webform with your intent to use the portal and wait for IRCC to create your account."
IRCC started doing online portal for COPR so try that too.
Hope this helps!
Thanks a lot I will try that now