I found Flixbus to be sleazy and a garbage service. Flixbus cancelled my bus trip then included only the option on the web site to get a voucher refund rather than cash refund, which should be illegal in my opinion. I tried calling customer service to get a refund but was kept on hold with no estimate of how long I would continue to be on hold and no callback option. It feels like they deliberately make refunds difficult to keep more money.