Hello @schechi ,
Welcome to Microsoft Q&A Platform. Thank you for reaching out & hope you are doing well.
I understand that you are unable to delete a Vnet and getting the following error "Subnet premierclo-050624448f-dbsubnet is in use by /subscriptions/xxxxx/resourceGroups/premiercloudwordpress_group/providers/Microsoft.Network/virtualNetworks/premierclo-050624448f-vnet/subnets/premierclo-050624448f-dbsubnet/serviceAssociationLinks/e379acb4-36a2-b8c5-8aff-76da41843835-sal and cannot be deleted".
You also confirmed that you already tried the workaround suggested in the below doc but it didn't help and would like help in getting a one-time free support.
I've sent you a private message with the next steps to offer you a one-time free support. Please check and respond.
Kindly let us know if the above helps or you need further assistance on this issue.
Please "Accept the answer" if the information helped you. This will help us and others in the community as well.