i can't disable gift voucher

i am using 3.0.2.0

I have to to extension >> order totals >> voucher
tried to disable it and save. it tell me is is successfully. but it still show it is enable.

i tried to uninstall this extension but in cart page. it is still there.

i tried to refresh dashboard cach, and extension modification refresh, it still on my view cart page.

what can i do in this case?

Nothing can be done until see the code, but you can hide that div using css so it will not appear in your cart page. Hope it helps.