Weird case , how do I delete a cluster under these circumstances I would like to know how to delete a cluster with this type of case. 

To explain, I created a cluster for two nodes and there was a bug so I had to stop the service on the first node. However after recovering the server, I can no longer see the cluster suddenly like that as if by magic in the failover manager, and when I ping the cluster is always available somewhere.  

How can I delete this cluster and redo a new one? Knowing that when I try to create one,  I am told that my second server is already in a cluster while the cluster in question is no longer visible.

Windows Server 2012 R2
Use the Remove-Cluster PowerShell command with -Force.