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How did you pay ?
If you used bank transfer, it takes a little time for the funds to be cleared and then you should get your email with activation code/license.

If you paid using paypal or credit card, etc. it should clear right away. If you didn’t receive an email, is it possible you made a typo in your email address.

Try the Resend avast License https://www.avast.com/resend-license-paid.php, you will need to enter the email that you used when purchasing the license.

The problem with the telephone support it can be handled by a third party support company, they don’t have access to the payment/order details.