how to inactivate my subscription to VPN?

I take it you are referring to the Mozilla VPN https://vpn.mozilla.org If so then see https://support.mozilla.org/en-US/kb/how-do-i-cancel-my-subscription-mozilla-vpn If this is is within thirty days then you may be able to get a refund https://support.mozilla.org/en-US/kb/how-do-i-request-refund-mozilla-vpn Mozilla VPN is one of Mozilla's premium products. In order to get premium support from a dedicated agent, please submit your question with your Mozilla VPN app by going to '''Settings''' > '''Help''' > '''Contact Support'''. Alternatively, you can sign in to the Mozilla account connected to your subscription here (if not already) and then use [/questions/new/mozilla-vpn/form this link]. This Mozilla VPN form link is also on top at Ask a Question > Mozilla VPN.