[google-cloud-sql-discuss] Unable to delete instance group

I tried to delete and instance group from console and it stuck and shows that i have a backend service still using that.

I have then removed the backend service from loadbalancer but the delete of instance group keep spinning there forever.

i tried to do the following from gcloud

 gcloud compute instance-groups managed delete group-xxxxx

and i got this 
- The resource 'projects/xxxxx/zones/asia-east1-a/instanceGroupManagers/group-xxxxx' was not found

when i do gcloud compute instance-groups list, the group is still there

then i tried

gcloud compute instance-groups managed create group-xxxxx --zone asia-east1-a --template web-e2-standard-4 --size 1

i got 
- The resource 'projects/xxxxx/zones/asia-east1-a/instanceGroupManagers/group-xxxxx' already exists

Any idea how i can get rid of this instance group?

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