Gilbert159!

Hello, I've not been trading/self employed for nearly 2 years now. Yet for the last few month, I've been receiving late penalty notices for not filing my self passement tax returns. I've rang up many times. Every time I get passed around and confused answers. Some say I don't need to do anything, some say I still need to do my self assessments. Some say they have filled things out for me and should be sorted. I was told to send a letter about my position and try to dispute the penalty notice. I've done that but nothing has happened. My company's has been dissolved for over a year now. I'm not sure what I'm supposed to go. The gov website is a maze or information with links that take you in circles. The letter now says i owe £300 and will incur £10 a day. I've only just received the letter and it says the extra charges started a month ago. I have no idea what to do and i definitely cant afford these charges!