Worst ISP Accounts department!

Finally found an ISP that works and their accounts department is useless. Messages sent that account is in arrears and service will be suspended when its not. Then an email stating it was a mistake. One month later emails sent saying account is now 2 months in arrears when I have the proof it is paid up to date. Then another mail saying they will double debit. When I call numerous times, no one gets back to me. I just keep getting mails saying its in arrears and they will double debit WITHOUT AUTHORIZATION! Then after double debiting my account, an email saying its a mistake? And that they will refund me? After I already spent money on bank statements as well as reversed the double debit? No one gave you permission to double debit my account when I AM NOT IN ARREARS! Sort out your useless accounts department!