You hit a flag for suspicious behavior and they can't tell you exactly what was suspicious because this allows fraudsters and criminal networks to adjust their operations accordingly.
People don't just get terminated for no reason.
Either you were doing something sketchy or you were acting in a behavior that is similar to previous fraud/criminal behavior.
I'm a legitimate customer and my credit card has been flagged for fraud numerous times at large companies (Steam, PayPal, eBay etc). Often temporarily, however.
(source: have worked in various fraud/risk departments)
People don't just get terminated for no reason.
Either you were doing something sketchy or you were acting in a behavior that is similar to previous fraud/criminal behavior.
I'm a legitimate customer and my credit card has been flagged for fraud numerous times at large companies (Steam, PayPal, eBay etc). Often temporarily, however.
(source: have worked in various fraud/risk departments)