Account closed for no apparent reason

I haven't been able to login and use my account, I have called trying to find the reason, no one can tell me why it was closed all of a sudden. Was asked to send through my documents (id, payslip, proof of res) I did that. I even uploaded it on their site. still nothing. I tried reaching out to them on social media, was told my docs were received, they're just being verified. For months..... docs are being verified for months... really. What's really upsetting is that i have never bought on credit, I paid everything upfront if I bought something. I don't understand why I am treated this way