I have to restore the backup as even you activate the plugin it was not working
You said that the site would be without plugin for 15-20 minutes even if say that at your end the cart option was working perfectly after deactivating the plugin then also I will accept that if you think that I will not accept that you can provide me a video proof along with that

As you said that the site would be without plugin for 15-20 minutes so I had prepared my self according, if you said that you will allow me to test the features and only activate after my confirmation then I will prepare accordingly to that