Poor systems

I've had an account with Home Choice for a few months and has never missed a payment. The last month I'm getting up to 7calls a day from them as well as msgs to te me my my account is in arrears and I must pay before any legal actions are taken. I will call them and ask them what the problem is and they Will then tell me my account is up to date. I will get transferred to the collections department and they will also tell me my account is up to date. A few minutes later again I get call. They are unable to tell me why I keep getting calls and that they will update their system. It seems it's not being done I still keep on getting calls. Once you start fighting they get defensive, but they can't seem to fix the problem. Seems like they don't know what's going on on their systems or don't know how to address a problem.