You can also get to them thru Trust Pilot to leave feedback and request refund.
https://www.trustpilot.com/review/cerebrumiq.com
"The combination of misleading pricing, unauthorized subscriptions, questionable test validity, and inadequate customer support suggests that Cerebrum IQ operates with a lack of transparency and ethical standards. Prospective users are advised to exercise caution and thoroughly research before engaging with the platform to avoid potential financial and personal data exploitation."
Beyond unexpected charges, there are numerous accounts of users being enrolled in subscriptions without explicit consent. A user on a Google Play support thread expressed frustration after being billed $69.99 for a subscription they did not intend to purchase, having only sought a simple certificate following an online test for $0.99. Such practices suggest that Cerebrum IQ employs a model where users are automatically subscribed to premium services without clear disclosure, leading to significant unauthorized charges."