If you haven't got a license of course it isn't unrealistic that they are trying to get you back to free.
Did you do as I suggested ?
"Log on to your Avast account id.avast.com, My Subscriptions > delete any reference to Avast Premium Subscriptions."
Because, if you still have that subscription listed than it is going to raise issues in regard to expired subscription.
As well as what is mentioned in an image "Active in 1 of 10 devices in the last 30 days" so if you have it installed on another device (mobile, etc.) you would need to remove that (if you haven't already done that) and drop back to the free version.
I haven't mentioned talking to Avast CS in any reply and none of the options require that.