Azure - Erroneous Invoice every month?

This issue keeps happening. I may need to report this to consumer forum now, if not resolved. This month invoice G18115***** is generated again, and G187875***** was generated last month for 1028.37 charges each month for Free Azure account subscription. In August I unsubscribed free credit-account, 5 days before expiry and I had no resources. Last months I raised a ticket (# 260-91-000--******). I posted on LinkedIn for this Azure erroneous charges. After many days the amount was refunded. Invoice is being generated every month even after cancelling my subscription. I kept all screenshots, including this message. I don't want to purchase paid support for $100 to get $90 refund. Would anyone please tell me how I can contact support about this? Thanks.