The good thing is that you have a prior response from Accra.....this is a prove that your application is already in progress.
In the meantime ,I really don't know the combinations of your name that you have tried.
I have got a couple of buddies who experience such scenarios ....I'll try to give you the solutions they employed.
Firstly ,send a CSE directly to CIC telling them you can not access your ECAS status with your family name........it may take up to a month but they will surely answer u...the link is below.....
https://dmp-portal.cic.gc.ca/enquiries-renseignements/canada-case-cas-eng.aspx
Secondly,send a CSE to Accra office that you can not access your ECAS status with your family name.......they should respond to you within a week.The link is below......
https://secure.cic.gc.ca/enquiries-renseignements/case-cas-eng.aspx?mission=accra
Thirdly,place a call to CIC in Canada with the number below and make your complaint ......you will get an immediate solution even though you need to be super patient as you may spend almost 20 or 30mins on Fone with them.Call them anytime for 12noon Nigerian time (8am in Canada ).
+1-613-944-4000
Select 1 for English
1 for foreign affairs
2 for immigration
Call is being transferred to CIC
1 for English
2 for status
1 for PR
8 digit client id number will be asked.
Like i said ,you need to be patient on Fone with them.
Lastly,before you try all the suggested options above(I don't know if you have tried these combinations ),
*Use your first name instead of your family name.
*Use a combination of your first name and family name together with no space in between.
* Use a combination of your first name and family name together with space in between.
* Use a combination of your family name and first name together with no space in between
* Use a combination of your family name and first name together with space in between
These are the solutions employed by my buddies that have same issues ...and they are fine now.
Cheers.