You don’t mention who exactly you spoke to or the contact number used so that this issue can be reported to avast directly ? You’ll also notice that at the top of the avast UI is a support tab, clicking on that then scrolling to the bottom of the page gives an option to report files the avast virus lab.

For future reference reporting false positives via this function is the quickest way to have solved your problem, usually hours or a day max has been my experience on reports.