Disappointed by the treatment received

I have been with Iemas for over 12yrs. I have bought all my vehicles through them and even have taken numerous loans with them. this week I app**** for vehicle finance. with my application I sent through docs of a wrongful judgment against my name including a settlement letter issued to iemas last year as well when i took a loan, stating that my account was paid up and settled. I'm sure Iemas verified it then. during the rush of my work day iemas asked for an updated letter. I took the same letter issued and changed the date, just the date, the authenticity of the body of the letter remained unchanged and the lawyers can verify that . Iemas blocked my account stating I committed '*****'. I even got a updated letter and issued it but they declined my application and blocked me as a member . I don't condone that changing the date was wrong but it was a hobest mistake. I never defaulted on a payment and have been a loyal customer for years. it was an honest mistake. Iemas refuses to help me or even consider opening my account even after I received the updated letter and sent an email. very disappointed in how I have been treated considering I'm a loyal customer for so long.