If your ad account is banned, you may not be able to email Tiktok from your account. Tiktok may give you an error message saying there “your account is unauthorized to file a ticket”   If Tiktok ban your ad Account because they suspect your account for fraudulent activity and they’d  keep banning all your ad accounts.  In this case you can reach out to Tiktok on Twitter @Tiktoksupport or create a new Tiktok Business manage Account from a new Device, sim and network. This way you’ll be able to get back to advertising on Tiktok with a new Account.