Hi there and welcome
If you stopped paying the fees then this will be why it does not work.
To try to re-enable it
Go to my link below
In the Manage features section, select Skype Number.
Click Get a Skype Number and follow the instructions to complete the purchase.
If it is still available and not provided to someone else, you will be give it else you will receive a new number
If you would like any additional information or assistance, please do not hesitate to let me know.
And if you can take a second to rate my service by clicking one of the stars at the top of the screen then submit, that would be greatly appreciated.