50 % Tax deduction of pay - on minimum wage

I am on minimum wage and I have no idea where from my pay that I owe HMRC tax. I have 2 jobs. The 2nd job is BR for which every week I paid 20% tax and NI if I went over the limit. In my main job I also paid tax every week and NI. I was shocked when on earning £212 they took £106 tax which is 50 %. I would like to request a clear breakdown with a full detailed explanation as to how this has occurred. I need to understand what has happened. It also says on my Gateway log in that my tax for 2023-2024 hasn't even been calculated. Is there a tax office I can go to to speak to somebody in person.

Hi,
We are unable to check personal records through the forum.
You can check your tax code using the following link:
Check your Income Tax for the current year
You can also contact our Income Tax team, using methods on the following link if you wish to discuss the make up of your tax code:
Income Tax: general enquiries
Thank you.