Hello Manic,
I regret for the inconvenience caused.
The emails you received are system generated and that is the reason why you were unable to reply.
I can sent you an email from our end.
You can reply to that email and we can continue our conversation via email.
You can also use the same email address for future interactions with AVG.
If you still wish to get refund, please let us know and we will escalate your request to the concerned team.