The first step to canceling the HBO Max subscription is to find out who is billing you for this service. You may have either signed up for a third-party billing provider or through Max.com/providers itself.
For instance, you may have used the HBO Max mobile app for this purpose. Find the right answer to this question with these steps:

• Head to HBOMax.com.
• Now, on your mobile device, click on your profile. Choose ‘Settings’ and go to ‘Subscription.’
• On a PC, tap on your profile. Now, select ‘Settings’ and locate ‘Subscription.’
• If you are using a smart TV, hit the ‘Settings’ icon followed by your ‘Account.’
• These steps will let you find out through whom your subscription is billed.