javascript not working on DynamicModelFormField

[leerobertsprojects]

Hi, I have a problem where i am trying to disable certain forms fields based on a tick box, i have included the javascript below

When on the Page, the VLAN field is a DynamicModelFormField and will never disable, but when toggling the switch on and off the fields do not re-enable, i know the event is getting fired because i can see it in the developer tools, the disabled tage gets applied and removed with no change on the page, This may be a simple mistake but would like if someone can point me in the right direction.
below is what the page looks like

when unticked, VLAN should be enabled and Service type and function should be disabled, when ticked it should be the other way round
Thanks