Erratic instalment amounts

What transpired to my initial complaint, it was not resolved. The investigation into my instalments over the last 36 months fell over the cliff, was it a suicide. The low and behold my instalment for 2/11 is again low? What happened this time? Gremlin in the system or someone hacking into my account? Either which way call me if its not too much trouble, maybe before Christmas day. Has IT investigated my billings erratic behaviour? Im sick and tired of this. Fix your damn system. Employ experienced staff. Resolve complaints within the prescribed service level agreements. And ask your complaints department to read before calling me with questions. It actually helps when you know why you are calling the client.