You can purchase any Avast product or service through the official website and make your payment online. However, if you encounter any errors while processing the payment you can refer to the steps below to resolve Avast billing problems:
• Step 1: Visit the official Avast support webpage, i.e., support.avast.com.
• Step 2: Click on ‘Sales and Billing’ and describe your problem
• Step 3: Select the Avast product you need help with and click ‘Next.’
• Step 4: Enter your contact information press ‘Submit Request.’
Once your request is submitted an Avast representative will contact you to help, you resolve the error. You can also call the Avast customer service phone number directly to get help with any error related to Avast.
Read more: avast support number