Free Account - Still charging after changing plan and I have not changed any other account information

I reviewed the Miro community and see someone opened a ticket to address a free account being billed. This has happened to me and I cannot find a solution to contact anyone, no e-mail, no online chat, nothing. I am the account owner, opened it up, upgraded the account for some time and then went back to the free version. This billing issue has continued on for 3-6 months or so now and I cannot stop the charges even though it says "free" account. I have not opened another account, deleted the user or anything. Please help