Have you had an independent consultation/evaluation from another surgeon? Preferable a doctor that is not close with your surgeon as that may be a conflict if they find something that is amiss.
Often a surgeon doesn't want to admit when a surgery didn't work out well..

Some pain could be internal scar tissue related, but that is hard to tell for sure.

If there is no other way to repair or help things a SCS or pain pump might be of help. Pain management.

But I would really get other opinions to find out as much as I can if something can be fixed or if pain management if the next step.