Hi. I’ve been paying monthly for the ‘paid version’. yesterday for no reason it wouldn’t allow me to upload anymore documents and said I needed to upgrade. I pay every month on the 18th for the last few months. On logging directly into my openai account I see there are no invoices and i’m on the free plan however I have been using chatgpt for a number of months and a regular payment comes out each month. I can’t find the answer to this question/issue anywhere. please help!