2469
What ’s more , Bambenek explained that this issue did n’t occur just once or twice , and on multiple occasions Fidelis observed phone numbers associated with telemarketing scammers signed up to use Telegram .
 ( discover vulnerability: observed,  Fidelis: discoverer, telemarketing scammers signed up to use Telegram: capabilities) 
Locate the role in the text that participated in the event based on the event type and return it in the event list. 
 Option: Event type: phishing, data breach, ransom, discover vulnerability, patch vulnerability, Arguments type: vulnerable system, capabilities, vulnerability, number of victim, issues addressed, compromised data, damage amount, common vulnerabilities and exposures, victim, patch number, number of data, tool, discoverer, time, purpose, place, payment method, releaser, vulnerable system version, attacker, supported platform, patch, price, vulnerable system owner, trusted entity, attack pattern. 
Text: {0} 
Answer:
 ( discover vulnerability: observed,  Fidelis: discoverer, telemarketing scammers signed up to use Telegram: capabilities) 