**** or Non-Existent balance

I decided to pay this balance even though i do not owe this company anything. My remaining balance on my staff account was settled when i resigned in December 2016 and the account was closed. Spoke to Staff Accounts department and a few other departments and they just keep transferring me.So i decided to pay this **** balance over the pass weekend then the staff at the store told me i cant pay it for some unknown reason.I want to take out a new contract cellphone and this is stopping me from doing so. Now i am not allowed to pay it and nobody at TFG can help me i am lost. Regret ever opening an account.I do not even have an account number or account card. Please help