Hi Rami,
Sorry for the issues you are having.
I can help troubleshoot them with you.
Here is the coding provided by WooCommerce to autocomplete orders:
http://docs.woothemes.com/document/automatically-complete-orders/
I would double check where you placed the coding in your theme correctly.
Also, it is impossible for WooCommerce Tickets to work without WooCommerce. So if that connection was broken no tickets would show on the site.
You could try following our testing for conflicts guide:
https://theeventscalendar.com/knowledgebase/testing-for-conflicts/
And place that autocomplete coding in another theme and see if that helps.
Otherwise, we are limited in resolving issues with WooCommerce, but I can try to help out some more.
Thanks