You can perform Test-SPOSite command to know whether those site collection is created under your tenant, if you get any unknown error then you can conclude that those site collection are not created successfully.
Test-SPOSite -Identity https://tenant.sharepoint.com/sites/sitecollectionname
So you need to contact Microsoft to delete those site collection ...
It seems that you tried to create the site from the Central Administration .
The best way to delete this site would be first go to the Manage content databases in the Central Administration , make the database read only .
Then go to the ssms, remove the database .
After this try to recreate the site using powershell .
Note :- Make sure that you have only ...