I haven't received my final social security number

Bonjour MA,

First, if you already have a social security number even a non-functional one, you do not have to access the website for foreign students anymore. You only have to deal with  your local caisse primaire d'assurance maladie (CPAM). 

If your rights are closed, you should call your local CPAM in order to check about your situation. It is possible they are waiting for complementary information.
If you already send documents to them, the processing times vary depending on the type of files and the number of files being processed by your caisse primaire d'assurance maladie (CPAM).

In order to contact your CPAM, you can have a look to the following topic: How to call the French Health Insurance Advice Lines?

Finally, if you do not succeed to access your personal space for caisse d'allocations familiales (Caf), you can call its helpline dialing 32 30.

Have a nice day.