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To get the role assigned to your account you will have to contact the owner of the subscription. Subscription owner will have all the permissions to assign a role to your account.
You can follow below steps to get information about owner of the subscription.
You can login to Azure Portal > Navigate to your target subscription > Click Access control (IAM) and scroll through role assignments you'll find the owners.
if you're specifically looking for the Account Administrator or Service Administrator for the subscription so you can view their contact info, you can do so by:
Visting the Subscriptions page in Azure portal, selecting the subscription you want to check, and then looking under Settings. Select Properties and the account administrator of the subscription is shown in the Account Admin box.
For more info - Determine account billing administrator
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