Never use Flight Network!!

Never use Flight Network!!
This company has the absolute worst customer service! They are impossible to contact after the fact when a problem needs to be addressed. I have spent hours on the phone and writing emails trying to get what I need.
All I needed from them after we cancelled our flights due to COVID was documentation. Simple documents stating that we received no refund or vouchers for future travel - so I could file a claim with my travel insurance company to be reimbursed. Impossible... Flight Network won't acknowledge me or respond in any way. I even contacted their parent company, (etraveli) in Sweden with no results.