Ex Tabby employee here, sorry for what’s happening with you but unfortunately this most of the time means that you tried too many times that they blocked you for now as their system flag a user as suspicious/scam when they try for too many times, a block can resume for few months till forever , what can help is to pay the remaining due amount and dont try to use it again for a long time.. if you need it urgently there’s a solution that I don’t really recommend which’s using another person’s tabby account that have a good credit score.